United States v. Casillas

This opinion is subject to revision before publication. UNITED STATES COURT OF APPEALS FOR THE ARMED FORCES _______________ UNITED STATES Appellant v. Nathaniel A. CASILLAS, Senior Airman United States Air Force, Appellee No. 26-0096 Crim. App. No. 40551 Argued May 20, 2026—Decided September 30, 2026 Military Judges: Matthew D. Talcott (Article 30a proceed- ings), Jennifer E. Powell (arraignment), Tyler B. Mussel- man (motions), and Christopher D. James (trial) For Appellant: Major Vanessa Bairos (argued); Ma- jor Allison R. Gish and Mary Ellen Payne, Esq. (on brief). For Appellee: Major Frederick J. Johnson (argued); Megan P. Marinos, Esq. Chief Judge MAGGS delivered the opinion of the Court, in which Judge OHLSON and Judge JOHNSON joined. Judge HARDY filed a separate dissenting opinion, in which Judge SPARKS joined. _______________  United States v. Casillas, No. 26-0096/AF Opinion of the Court Chief Judge MAGGS delivered the opinion of the Court. A general court-martial found Appellee guilty of one specification of possessing child pornography and one spec- ification of viewing child pornography in violation of Article 134, Uniform Code of Military Justice (UCMJ), 10 U.S.C. § 934 (2018). United States v. Casillas, No. ACM 40551, 2025 CCA LEXIS 445, at *1-2, 2025 WL 2675840, at *1 (A.F. Ct. Crim. App. Sept. 18, 2025) (unpublished). Evi- dence at trial established that this child pornography was stored on Appellee’s smartphone. Id. at *5-6, 2025 WL 2675840, at *2. On appeal to the United States Air Force Court of Criminal Appeals (AFCCA), Appellee argued that these findings violated the Fifth Amendment’s prohibition against double jeopardy because a previous court-martial had already found him guilty of possessing and viewing child pornography on the same phone. Id. at *23-29, 2025 WL 2675840, at *9-11. The AFCCA initially concluded that Appellee had af- firmatively waived any double jeopardy issue at trial. Id. at *19-21, 2025 WL 2675840, at *8. With respect to the pos- session specification, however, the AFCCA used its author- ity under Article 66(d), UCMJ, 10 U.S.C. § 866(d) (2018), to review the double jeopardy issue for plain error despite the waiver. Casillas, 2025 CCA LEXIS 445, at *21-22, 2025 WL 2675840, at *8-9. Relying on United States v. Forrester, 76 M.J. 479 (C.A.A.F. 2017), the AFCCA concluded that a dou- ble jeopardy violation had occurred and therefore set aside the finding of guilty with respect to the possession specifi- cation. Casillas, 2025 CCA LEXIS 445, at *23-29, 2025 WL 2675840, at *9-11. The AFCCA, however, affirmed the find- ing that Appellee was guilty of viewing child pornography because the issue was waived. Id. at *29-32, 2025 WL 2675840, at *11-12. The AFCCA also held that trial defense counsel had not provided ineffective assistance of counsel. Id. at *32-38, 2025 WL 2675840, at *12-13. Major General Mitchel Neurock, performing the duties of the Air Force Judge Advocate General, certified three is- sues for this Court to review. Certified Issue I is: “Did the [AFCCA] err when it found that [Appellee’s] rights against 2  United States v. Casillas, No. 26-0096/AF Opinion of the Court double jeopardy were violated when he was charged at two separate courts-martial for possessing different images of child pornography on the same device?” This certified issue essentially asks whether the AFCCA’s reading of Forrester was incorrect. In Forrester, this Court held that the govern- ment may charge an accused with separate specifications of possessing child pornography on different devices even if the images on the devices are identical. 76 M.J. at 481, 486-87. Here, the AFCCA concluded that an “apparent cor- ollary” of Forrester is that the Government may not charge an accused with separate specifications of possessing child pornography for having different images on a single device. Casillas, 2025 CCA LEXIS 445, at *24-25, 2025 WL 2675840, at *9. We answer this issue in the affirmative. The AFCCA should not have set aside the finding that Ap- pellee was guilty of possessing child pornography based on double jeopardy grounds. We hold that if any double jeop- ardy error occurred, the error was not clear or obvious un- der current law and therefore does not warrant relief under plain error review. We leave a more complete treatment of this subject to a future case. Certified Issue II is: “If the [AFCCA] correctly set aside the finding of guilty as to the possession specification based on double jeopardy, did the [AFCCA] err by declining to set aside the finding of guilty as to the viewing specification based on double jeopardy?” We cannot directly answer this question because its predicate is not established. As indi- cated above, in answering Certified Issue I, we conclude that the AFCCA did not correctly set aside the finding of guilty as to the possession specification. But under plain error review, we do reject Appellee’s double jeopardy argu- ment with respect to the viewing specification because any error, if there was an error, was not clear or obvious under current law and therefore does not warrant relief. Certified Issue III is: “The trial defense counsel failed to assert the prohibitions against double jeopardy in defense of [Appellee]. If trial defense counsel waived this issue, did the [AFCCA] err by declining to find ineffective assistance of counsel?” Agreeing with the AFCCA’s analysis, we 3  United States v. Casillas, No. 26-0096/AF Opinion of the Court answer this issue in the negative. Given the uncertainty in the law, we cannot say that trial defense counsel’s perfor- mance was deficient, and therefore we hold that there was no ineffective assistance of counsel. Based on our answer to Certified Issue I, we set aside the decision of the AFCCA as to the possession specifica- tion and as to the sentence. We remand the case for further review under Article 66, UCMJ, and to allow the AFCCA to consider any issues mooted by its decision, consistent with this opinion. I. Background Appellee was tried twice by general court-martial. In the first court-martial (hereinafter Casillas I), Appellee was charged with numerous offenses. These offenses in- cluded one specification of possessing child pornography and one specification of viewing child pornography that are relevant to this appeal. Possessing and viewing child por- nography are enumerated offenses under Article 134, UCMJ. Manual for Courts-Martial, United States pt. IV, para. 95.b.(1) (2019 ed.) (MCM). The MCM defines “[c]hild pornography” as “material that contains either an obscene visual depiction of a minor engaging in sexually explicit conduct or a visual depiction of an actual minor engaging in sexually explicit conduct.” Id. para. 95.c.(4). The possession specification in Casillas I, as amended after arraignment, alleged that Appellee: [d]id, within the Republic of Korea, between on or about 1 December 2019 and on or about 24 March 2020, within an iPhone XR, knowingly and wrong- fully possess child pornography, to wit: a visual depiction of minors, or what appears to be minors, engaging in sexually explicit conduct, and that said misconduct was of a nature to bring discredit upon the armed forces. The viewing specification alleged that Appellee: [d]id, at an unknown location, between on or about 1 December 2019 and on or about 24 March 2020, within an iPhone XR, knowingly and wrongfully view child pornography, to wit: a visual depiction 4  United States v. Casillas, No. 26-0096/AF Opinion of the Court of minors, or what appear to be minors, engaging in sexually explicit conduct, and that said conduct was of a nature to bring discredit upon the armed forces. Before trial began on these specifications, investigators located thirteen additional images in Adobe portable document file (PDF) format of suspected child pornography on Appellee’s iPhone XR. In the light of this discovery, trial counsel initially sought to modify the Casillas I possession and viewing specifications to allege “visual depictions” instead of “a visual depiction.” Trial defense counsel, however, opposed these modifications as major changes to the specifications. Trial counsel therefore withdrew the request to modify the specifications in Casillas I. Trial counsel did attempt to admit the thirteen PDFs under Military Rule of Evidence 404(b). But trial defense counsel opposed this too, and the PDFs were excluded from Appellee’s trial as untimely. The court-martial found Appellee guilty of the possession and viewing specifications in addition to other specifications alleging other offenses. Appellee was sentenced to confinement for two years, reduction to the grade of E-4, forfeiture of all pay and allowances, and a reprimand. The thirteen images that were not addressed in Casil- las I became the subject of a second court-martial (herein- after Casillas II), which is the court-martial now under re- view. In Casillas II, Appellee was again charged with possessing and viewing child pornography. The possession specification in Casillas II alleged that Appellee: [d]id, within the Republic of Korea, between on or about 1 December 2019 and on or about 18 March 2020, knowingly and wrongfully possess child por- nography, to wit: visual depictions of a minor, or what appears to be a minor, engaging in sexually explicit conduct, and that said conduct was of a nature to bring discredit upon the armed forces. The viewing specification alleged that Appellee: [d]id, within the Republic of Korea, between on or about 1 December 2019 and on or about 18 March 2020, knowingly and wrongfully view child 5  United States v. Casillas, No. 26-0096/AF Opinion of the Court pornography, to wit: visual depictions of a minor, or what appears to be a minor, engaging in sex- ually explicit conduct, and that said conduct was of a nature to bring discredit upon the armed forces. Prior to trial, the military judge confirmed with counsel for both parties that the images of alleged child pornogra- phy at issue in Casillas II were not introduced into evi- dence in Casillas I. The military judge commented: “[T]he obvious reason I’m asking these questions [is] . . . double jeopardy concerns. My understanding is if the parties have any concerns with any double jeopardy aspects of this court-martial they’ll bring it to my attention via appropri- ate motion.” Appellee’s defense counsel did not make any double jeopardy objection at any point during Casillas II. The court-martial in Casillas II found Appellee guilty of both specifications and sentenced him to four years and eleven months of confinement, reduction to the grade of E- 1, and a reprimand. On appeal to the AFCCA, Appellee argued that the find- ings of guilty in this case violated the prohibition against double jeopardy. Casillas, 2025 CCA LEXIS 445, at *2, 2025 WL 2675840, at *1. As mentioned previously, the AFCCA exercised its authority under Article 66(d), UCMJ, to review this issue with respect to the possession specifi- cation for plain error even though the AFCCA concluded that Appellee had waived the issue. Id. at *22-29, 2025 WL 2675840, at *9-11. The AFCCA then held that a double jeopardy violation had occurred based on this Court’s deci- sion in Forrester and the definition of child pornography in the MCM. Id. at *24-26, 2025 WL 2675840, at *9-10. The AFCCA first summarized the reasoning of For- rester as follows: [The Court] in Forrester emphasized that the op- erative definition defines “child pornography” as the “material that contains” the illicit images, ra- ther than the images themselves. Thus in For- rester it was permissible for the Government to prosecute separate specifications for each of the appellant’s devices that contained illicit images, 6  United States v. Casillas, No. 26-0096/AF Opinion of the Court regardless of whether those images were the same or different from device to device, because it was the possession of the “material” containing the im- ages (i.e., the device) that represented each of- fense. Id. at *24, 2025 WL 2675840, at *9 (citation omitted). The AFCCA then deduced that an “apparent corollary of this reasoning is that contemporaneous possession of multiple illicit images in the same ‘material’ represents a single of- fense of possession of child pornography, because ‘child por- nography’ is defined as the ‘material’ (e.g., the device con- taining the images) rather than each image itself.” Id. at *24-25, 2025 WL 267840, at *9. Based on this apparent cor- ollary, the AFCCA held that the Government could not charge Appellee with two specifications of possessing child pornography on his iPhone XR (i.e., one specification in Casillas I and a second specification in Casillas II), even though the specifications concerned different images. 1 Id. at *25-26, 2025 WL 2675840, at *10. The AFCCA therefore set aside the finding that Appellee was guilty of possessing child pornography and dismissed the specification. Id. at *29, 2025 WL 2675840, at *11. Accordingly, the AFCCA de- termined that any ineffective assistance of counsel claim with respect to the possession specification was moot. Id. at *37, 2025 WL 2675840, at *13. The AFCCA chose not to disregard Appellee’s waiver of a double jeopardy objection to the viewing specification. Id. at *29-32, 2025 WL 2675840, at *11-12. It further deter- mined that this waiver did not amount to ineffective assis- tance of counsel. Id. at *37-38, 2025 WL 2675840, at *13. The AFCCA explained that “Forrester does not directly ap- ply, and so far as we can discern has not been applied, to 1 In reaching this conclusion, the AFCCA recognized that the possession specification in Casillas II did not identify the material in which Appellee possessed the images at issue, but stated: “[F]rom the record it is abundantly clear the images at issue were contained on the same iPhone XR . . . alleged in Casillas I.” Casillas, 2025 CCA LEXIS 445, at *25, 2025 WL 2675840, at *10. 7  United States v. Casillas, No. 26-0096/AF Opinion of the Court the offense of wrongfully viewing child pornography.” Id. at *38, 2025 WL 2675840, at *13. The AFCCA concluded that “given the current state of the law, we do not find trial de- fense counsel’s performance measurably below the stand- ard expected of reasonably competent but imperfect coun- sel with respect to [the viewing specification].” Id., 2025 WL 2675840, at *13. The AFCCA therefore affirmed the finding of guilty for the viewing specification. Id. at *74, 2025 WL 2675840, at *25. After considering other issues, the Court reassessed Appellee’s sentence to confinement for two years and reduction to the grade of E-1. Id., 2025 WL 2675840 at *25. One judge concurred in part and dissented in part. Id., 2025 WL 2675840, at *25 (Mason, J., concurring in part and dissenting in part). He disagreed with the decision to disregard Appellee’s waiver of the double jeopardy issue. Id. at *74-75, 2025 WL 2675840, at *25. In addition, he concluded that Forrester was inapplicable because Forrester answered only the question of whether a single image could be chargeable on multiple devices where all the devices are identified in the specifications. Id. at *78- 80, 2025 WL 2675840, at *27. He found it significant that the possession specification in this case did not identify a device containing the child pornography. Id. at *79, 2025 WL 2675840, at *27. II. Double Jeopardy and the Possession Specification Certified Issue I, as noted, asks whether the AFCCA erred when it found that Appellee’s rights against double jeopardy were violated because he was charged at two sep- arate courts-martial for possessing different images of child pornography on the same device. A. Standard of Review The parties dispute the standard of review applicable to Certified Issue I. The Government’s principal position is that there never has been any double jeopardy issue, either to waive or to forfeit, because Appellee consented to being tried by separate courts-martial. To support this position, the Government cites Article 44(a), UCMJ, 10 U.S.C. 8  United States v. Casillas, No. 26-0096/AF Opinion of the Court § 844(a) (2018), which provides: “No person may, without his consent, be tried a second time for the same offense.” (Emphasis added.) Alternatively, the Government asserts that even if trying Appellee in a second court-martial raised a double jeopardy issue, Appellee knowingly and in- telligently waived his right to any double jeopardy claim. The Government recognizes that the AFCCA generally has authority to disregard waivers under Article 66(d), UCMJ, but contends that the AFCCA abused its discretion in dis- regarding the waiver in this case because it had no legiti- mate reason for doing so. Finally, the Government argues that Appellee cannot show a double jeopardy violation even under a plain error standard of review. Appellee, for his part, argues that his prosecution for possessing child por- nography in this case was plain and obvious error. 2 Having considered these arguments and the wording of Certified Issue I, we are persuaded that we must review the double jeopardy issue with respect to the possession specification for plain error. Certified Issue I simply asks whether the AFCCA erred in finding that Appellee’s rights against double jeopardy were violated when he was charged at two separate courts-martial for possessing child pornography. The certified issue does not expressly raise the issue of waiver or expressly challenge the plain error standard of review that the AFCCA applied when it de- cided the double jeopardy issue. And while certified or as- signed issues in some cases may contain an implicit chal- lenge to the standard of review applied by a Court of Criminal Appeals (CCA), we are not persuaded that Certi- fied Issue I implicitly invites the kinds of arguments about the standard of review that the Government now makes in 2 In his brief, Appellee does not expressly discuss waiver with respect to the possession specification. But with respect to the viewing specification, Appellee argues the AFCCA erred in hold- ing that he affirmatively waived any double jeopardy issue be- cause the record does not establish an intentional relinquish- ment of a known right. He contends that this Court should apply a plain error standard of review because Appellee merely for- feited his double jeopardy objection. 9  United States v. Casillas, No. 26-0096/AF Opinion of the Court its briefs. Given the centrality of the standard of review to the AFCCA’s analysis, if Major General Neurock had wanted this Court to reopen the issue, it is reasonable to expect that he would have certified a more specific question on the subject. We therefore will review the double jeop- ardy issue under the same plain error standard of review that the AFCCA applied. Under the plain error standard of review, this Court may address an error if it determines (1) that there was error; (2) that the error was clear or obvious; and (3) that the error materially prejudiced a substantial right. United States v. Robinson, 77 M.J. 294, 299 (C.A.A.F. 2018). In United States v. Bungert, 62 M.J. 346, 348 (C.A.A.F. 2006), this Court explained that “all three prongs must be satis- fied in order to find plain error” and that “the failure to establish any one of the prongs is fatal to a plain error claim.” In some cases, this Court has focused on the second element of plain error review, concluding only that an al- leged error was not “clear or obvious.” See, e.g., United States v. McClour, 76 M.J. 23, 26 (C.A.A.F. 2017) (finding no plain error because “it cannot be said that any error (if error there were) on the military judge’s part . . . is clear or obvious”); United States v. Maynard, 66 M.J. 242, 245 (C.A.A.F. 2008) (finding no plain error because the appel- lant “failed to establish on appeal that the admission of [certain evidence] was so obviously erroneous, if erroneous at all, that the military judge can be faulted for taking no action”). B. Discussion In Forrester, a court-martial found the appellant guilty of four specifications of possessing child pornography. 3 76 M.J. at 482. Three specifications alleged that he possessed the child pornography on a different physical device (i.e., a hard drive, another hard drive, and a laptop), and a fourth 3 The court-martial initially found the appellant guilty of six specifications, but the military judge merged two of these specifications into two other specifications. Forrester, 76 M.J. at 481-82. 10  United States v. Casillas, No. 26-0096/AF Opinion of the Court specification alleged that he possessed the child pornogra- phy in an email account. Id. at 481-82. The images that he possessed in these different devices and in the email ac- count were “visually similar or identical.” Id. at 482 n.2. This Court held that the specifications were not multi- plicious based on the definition of child pornography as “material that contains” illicit images. Id. at 486 (internal quotation marks omitted) (quoting MCM pt. IV, 68b.c.(1) (2012 ed.)). The Court reasoned: Because pt. IV, para. 68b [now MCM pt. IV, para. 95.c.(4)] defines “[c]hild [p]ornography” not as images but “material[s]” that contain them, it matters not that the images extant on each mate- rial listed in the bill of particulars were visually similar or identical for each count of possession. Under the plain language of [this definition], [a]ppellant completed the offense of possession each time he knowingly possessed, directly or con- structively, a distinct “material”—which includes [a]ppellant’s . . . laptop, . . . hard drives, and . . . e-mail account—that contained visual depictions of child pornography. Id. (second, third, and fourth alterations in original). The specific holding of Forrester does not directly apply to this case. Appellee, unlike the appellant in Forrester, was not found guilty of separate specifications of pos- sessing child pornography on separate devices containing identical images. Instead, Appellee was found guilty of two specifications of possessing child pornography on the same device, with each specification addressing different images. Appellee, however, agrees with the AFCCA that a “log- ical corollary” of Forrester is that an accused cannot be found guilty of separate specifications alleging possession of different images on the same device. The Government disagrees, arguing that Forrester does not establish that an electronic device must be the unit of prosecution for posses- sion of child pornography offenses. The Government as- serts that Forrester “leaves open the possibility that a dif- ferent ‘storage location’ for a visual depiction, such as an 11  United States v. Casillas, No. 26-0096/AF Opinion of the Court individual computer file, could be the applicable unit of prosecution.” We do not decide in this case which argument is correct. Instead, we decide only that it is not clear or obvious that finding Appellee guilty of the possession specification in Casillas II violated the prohibition against double jeop- ardy. Accordingly, Appellee is not entitled to relief under plain error review. Several factors lead us to these conclusions. The first factor is that this Court has not specifically addressed the question of whether, or under what circumstances, an ac- cused may be charged with multiple specifications of pos- sessing child pornography on a single device. That was not the issue in Forrester. And since deciding Forrester, the Court does not appear to have considered any cases that clearly involved multiple specifications of possessing child pornography on the same device. The Court thus has not had an opportunity to decide the issue before now. A second factor is that Forrester itself contains language that points in different directions. On one hand, the Court in Forrester states that the offense of possessing child por- nography “is tied to ‘material that contains’ illicit visual de- pictions of child pornography, not the quantity or variety of visual depictions.” 76 M.J. at 481 (citation omitted). This language suggests that there can be only one specification per “material” regardless of how many images or how many different images are stored on the “material.” But a coun- tervailing consideration is that the Court in Forrester never stated that only a physical device (such as a smartphone) can be a “material” that contains child pornography. On the contrary, the Court in Forrester recognized an email ac- count as a “material” and possession was prohibited on “the physical media or storage location” containing the child pornography. Id. at 486 (emphasis added). The decision thus leaves unclear whether a digital folder or a file also could be a “material.” In addition, the specifications at is- sue in Forrester specifically identified the devices and email account containing the child pornography. Id. at 481-82. The Forrester opinion did not discuss 12  United States v. Casillas, No. 26-0096/AF Opinion of the Court specifications, like the possession specification in the pre- sent case, that do not expressly identify the material con- taining the child pornography. A third factor is that the CCAs have reached somewhat conflicting conclusions about whether the government can charge the accused with multiple specifications of pos- sessing child pornography on a single physical device. Some opinions support Appellee’s view that the govern- ment may not do so. The majority opinion of the AFCCA in this case is one example. Similar is the decision of the United States Army Court of Criminal Appeals in United States v. Mobley, 77 M.J. 749, 751-52 (A. Ct. Crim. App. 2018), which squarely held, on the basis of Forrester, that multiple specifications alleging possession of child pornog- raphy on the same device are multiplicious. See also United States v. Black, No. ARMY 20170140, 2018 CCA LEXIS 369, at *1-2, 2018 WL 3493546, at *1 (A. Ct. Crim. App. July 13, 2018) (unpublished) (following Mobley on this point); United States v. Smith, No. ARMY 20180047, 2019 CCA LEXIS 168, at *1, 2019 WL 1594777, at *1 (A. Ct. Crim. App. Apr. 12, 2019) (unpublished) (same). Supporting the Government’s position that the “mate- rial” containing child pornography need not be a physical device is the AFCCA’s recent decision in United States v. Coley, No. ACM 40675, 2026 CCA LEXIS 69, 2026 WL 395909 (A.F. Ct. Crim. App. Feb. 12, 2026) (unpublished). In Coley, the appellant pleaded guilty to three specifica- tions of possessing child pornography. Id. at *1, 2026 WL 395909, at *1. On appeal to the AFCCA, the appellant ar- gued that two specifications were multiplicious because “both specifications are based on his possession of the same ‘material’ containing illicit visual depictions—his Samsung tablet.” Id. at *12, 2026 WL 395909, at *5. The AFCCA held that the appellant had waived any multiplicity objection by pleading guilty. Id. at *14-15, 2026 WL 395909, at *5. The AFCCA then declined to disregard the waiver as it had done in Casillas. Id. at *21, 2026 WL 395909, at *7. Even though the specifications alleged that the appellant pos- sessed the child pornography on a single device, the 13  United States v. Casillas, No. 26-0096/AF Opinion of the Court AFCCA found it persuasive that the specifications alleged that the possessions occurred at “distinct times and in dif- ferent geographic locations.” Id., 2026 WL 395909, at *7. Importantly, the AFCCA emphasized that “neither For- rester nor Casillas held that the [g]overnment is bound to rely on a physical device as the unit of prosecution, and the specifications at issue in [Coley] did not explicitly do so.” Id., 2026 WL 395909, at *7. Based on these three factors, we cannot say that it was clear or obvious error to find Appellee guilty of multiple separate specifications alleging possession of different im- ages on the same device. The law on this point is not suffi- ciently settled to make that determination. In reaching this conclusion, however, we emphasize three points. First, nothing in this decision calls into question Forrester’s hold- ing that separate specifications may allege possession of the same images on different devices. Second, because this case comes before us on plain error review, and we have concluded only that any error was not clear or obvious, we express no final opinion on whether the government may charge multiple specifications alleging possession of differ- ent images on the same device. We will address that issue if it is properly preserved and presented to this Court. Third, the issue does not arise if all images or videos are charged in a single specification of possessing child pornog- raphy. III. Double Jeopardy and the Viewing Specification Certified Issue II asks a conditional question about the viewing specification: “If the [AFCCA] correctly set aside the finding of guilty as to the possession specification based on double jeopardy, did the [AFCCA] err by declining to set aside the finding of guilty as to the viewing specification based on double jeopardy?” Because we have concluded that the AFCCA did not correctly set aside the findings in this case, the predicate of this question is not met. We therefore cannot answer the certified issue as posed. Similar to Certified Issue I, however, this Court has not specifically addressed the question of whether, or under 14  United States v. Casillas, No. 26-0096/AF Opinion of the Court what circumstances, an accused may be charged with mul- tiple specifications of viewing different child pornography images on a single device. That was not the issue in For- rester. Consequently, like the AFCCA, we “do not defini- tively resolve this question one way or the other.” Casillas, 2025 CCA LEXIS 445, at *32, 2025 WL 2675840, at *12. And therefore, it was not clear or obvious error to find Ap- pellee guilty of the viewing specification in Casillas II. IV. Ineffective Assistance of Counsel Certified Issue III asks: “If trial defense counsel waived [the double jeopardy] issue, did the [AFCCA] err by declining to find ineffective assistance of counsel?” To prevail on an ineffective assistance of counsel claim, a party must “demonstrate[] both ‘(1) that his counsel’s performance was deficient, and (2) that this deficiency resulted in prejudice.’ ” United States v. Palik, 84 M.J. 284, 288 (C.A.A.F. 2024) (quoting United States v. Captain, 75 M.J. 99, 101 (C.A.A.F. 2016)). This Court reviews de novo claims of ineffective assistance of counsel. Id. The AFCCA, as noted above, held that trial defense counsel were not deficient in waiving the double jeopardy issue with respect to the viewing specification given the “current state of the law.” Casillas, 2025 CCA LEXIS 445, at *38, 2025 WL 2675840, at *13. The AFCCA emphasized that it was not clear whether Forrester applied to viewing specifications or only to possession specifications. Id., 2025 WL 2675840, at *13. We agree with this reasoning and with the AFCCA’s conclusion that trial defense counsel did not provide ineffective assistance. The AFCCA did not address the question whether trial defense counsel provided ineffective assistance by waiving a double jeopardy objection to the possession specification because the issue was moot after the AFCCA set aside the specification. Id. at *37, 2025 WL 2675840, at *13. The sit- uation for us is different; we must decide the issue because we have determined that the possession specification should not be set aside based on double jeopardy. However, again given the current state of the law, where it is not 15  United States v. Casillas, No. 26-0096/AF Opinion of the Court clear or obvious that Forrester prevents the government from charging multiple specifications of possessing differ- ent child pornography images on a single device, we cannot say that counsel were deficient for failing to raise a double jeopardy argument. We thus also conclude that trial de- fense counsel did not provide ineffective assistance with re- spect to the possession specification. V. Other Issues The AFCCA determined the evidence was factually suf- ficient with respect to the viewing specification. Id. at *45, 2025 WL 2675840, at *16. However, because the AFCCA set aside the finding of guilty as to the possession specifi- cation, it did not determine the factual sufficiency of the evidence for that specification. As we have concluded that the AFCCA should not have set aside the finding of guilty with respect to the possession specification under plain er- ror review, we remand the case for a factual sufficiency re- view of this finding. The AFCCA also reassessed Appellee’s sentence in the light of its decision to set aside the findings of guilty with respect to the possession specification. Id. at *72-74, 2025 WL 2675840, at *25. We set aside that aspect of the AFCCA’s decision. A new review of the sentence is there- fore also necessary. Consistent with this opinion, the AFCCA may decide other issues previously mooted by its opinion. VI. Conclusion We answer Certified Issue I in the affirmative, we can- not answer Certified Issue II because its predicate is not established, and we answer Certified Issue III in the nega- tive. The decision of the United States Air Force Court of Criminal Appeals is set aside as to Specification 1 of the Charge, is affirmed as to Specification 2 of the Charge, and is set aside as to the sentence. The case is returned to the Judge Advocate General of the Air Force for further review under Article 66, UCMJ, 10 U.S.C. § 866 (2018), and to de- cide any issues mooted by its previous decision, consistent with this opinion. 16  United States v. Casillas, No. 25-0096/AF Judge HARDY, with whom Judge SPARKS joins, dissenting. In United States v. Forrester, this Court held that the unit of prosecution for the offense of possession of child pornography under the General Article 1 is a “physical media or storage location ‘that contains’ the offensive images.” 76 M.J. 479, 486 (C.A.A.F. 2017) (quoting Manual for Courts-Martial, United States pt. IV, para. 68b (2012 ed.) (Manual or MCM)). Accordingly, a defendant completes the offense each time he knowingly possesses “a distinct ‘material’ ” that contains visual depictions of child pornography. Id. In this case, the Government charged Appellee with possessing child pornography on a specific physical me- dia—his iPhone XR—at a specific time and place. But after the Government found additional obscene images on the cell phone, the Government charged Appellee with the same offense again—possessing child pornography on the same iPhone XR at the same time and at the same place as the first charge. Because the second charge clearly and plainly violated the Double Jeopardy Clause of the Fifth Amendment, I would affirm the decision of the United States Air Force Court of Criminal Appeals (AFCCA). I. Background The relevant facts in this case are straightforward. In March 2020, after the National Center for Missing and Ex- ploited Children contacted the Air Force Office of Special Investigations (AFOSI) about an email account associated with Appellee suspected of trafficking in child pornogra- phy, AFOSI seized Appellee’s cell phone—an iPhone XR. AFOSI sent Appellee’s cell phone to the Cyber Crimes Cen- ter where a forensic examination confirmed the presence of child pornography. As relevant here, the Government charged Appellee with two specifications of violating Article 134, UCMJ, one for possessing child pornography on his iPhone XR and one for viewing child pornography on his iPhone XR. In both 1 Article 134, Uniform Code of Military Justice (UCMJ), 10 U.S.C. § 934 (2018).  United States v. Casillas, No. 26-0096/AF Judge Hardy, dissenting. specifications, the Government alleged that Appellee’s con- duct occurred in the Republic of Korea between December 1, 2019, and March 24, 2020, and was of a nature to bring discredit upon the armed forces. In November 2022, while preparing for Appellee’s first court-martial, the Government’s forensic analyst discov- ered thirteen additional images in Adobe portable docu- ment file (PDF) format containing child pornography on Appellee’s iPhone XR that the analyst had not previously identified. The newly discovered PDF files had been stored on Appellee’s iPhone on January 6-7, 2020, squarely within the time period specified by the Government in its Arti- cle 134 charges against Appellee. Trial counsel attempted to introduce evidence of the thirteen newly discovered files at Appellee’s first court-martial in various ways, but the military judge denied those attempts. In response, in Feb- ruary 2023, and while Appellee’s first court-martial was still pending, the convening authority referred a new Arti- cle 134 charge with two nearly identical specifications to those from Appellee’s pending first court-martial—one for possessing child pornography and one for viewing child pornography—for trial by a second general court-martial. The following month, in March 2023, a general court- martial composed of officer members convicted Appellee, contrary to his pleas, of a total of four charges and nineteen specifications, including the two specifications of wrong- fully possessing and wrongfully viewing child pornography on his iPhone XR. The members sentenced Appellee to con- finement for two years, reduction to the grade of E-4, for- feiture of all pay and allowances, and a reprimand. In the spring of 2023, at a pretrial hearing for Appellee’s second court-martial, the military judge queried the par- ties about “double jeopardy concerns” presented in the case. The military judge informed Appellee’s defense counsel that he expected that they would raise “any concerns with any double jeopardy aspects of this court-martial . . . via appropriate motion.” Although Appellee’s defense counsel later averred that they recognized the double jeopardy is- sue presented by the Government’s decision to prosecute Appellee twic