United States v. Casillas

United States Air Force Court of Criminal Appeals·Decided September 18, 2025·No. 40551·Unpublished

Opinion

U NITED S TATES A IR F ORCE C OURT OF C RIMINAL APPEALS

No. ACM 40551

UNITED STATES

Appellee

v.

Nathaniel A. CASILLAS

Senior Airman (E-4), U.S. Air Force, Appellant

Appeal from the United States Air Force Trial Judiciary Decided 18 September 2025

Military Judge: Matthew D. Talcott; 1 Jennifer E. Powell (arraignment); Tyler B. Musselman (motions hearing); Christopher D. James. Sentence: Sentence adjudged 26 June 2023 by GCM convened at Osan Air Base, Republic of Korea. Sentence entered by military judge on 11 August 2023: Confinement for 4 years and 11 months, reduction to E-1, and a reprimand. For Appellant: Major Samantha P. Golseth, USAF. For Appellee: Colonel G. Matt Osborn, USAF; Lieutenant Colonel Thomas J. Alford, USAF; Lieutenant Colonel J. Peter Ferrell, USAF; Lieutenant Colonel Jenny A. Liabenow, USAF; Major Vanessa Bairos, USAF; Major Kate E. Lee, USAF; Mary Ellen Payne, Esquire. Before JOHNSON, MASON, and KEARLEY, Appellate Military Judges. Chief Judge JOHNSON delivered the opinion of the court, in which Judge KEARLEY joined. Judge MASON filed a separate opinion concurring in part and dissenting in part.

1 Pursuant to Article 30a, Uniform Code of Military Justice (UCMJ), 10 U.S.C. § 830a.

This is an unpublished opinion and, as such, does not serve as precedent under AFCCA Rule of Practice and Procedure 30.4.

JOHNSON, Chief Judge:

A general court-martial composed of officer members convicted Appellant, contrary to his pleas, of one specification of wrongfully possessing child pornography and one specification of wrongfully viewing child pornography, both in violation of Article 134, Uniform Code of Military Justice (UCMJ), 10 U.S.C. § 934.2 The court members sentenced Appellant to be confined for four years and 11 months, reduction to the grade of E-1, and a reprimand. The convening authority did not modify the findings or sentence, but deferred the reduction in grade and automatic forfeitures until entry of judgment, waived automatic forfeitures for six months or the expiration of Appellant’s term of service for the benefit of Appellant’s dependents, and supplied the language of the adjudged reprimand.

Appellant raises 12 issues on appeal, which we have reworded: (1) whether the Double Jeopardy Clause of the Fifth Amendment3 requires Appellant’s convictions to be set aside because Appellant was twice tried for the same “material ;” (2) whether Appellant was denied effective assistance of counsel with respect to double jeopardy; (3) whether the Government improperly severed known offenses without proof of a manifest injustice; (4) whether the findings are factually insufficient; (5) whether the two specifications are multiplicious; (6) whether Appellant was denied effective assistance of counsel with respect to multiplicity; (7) whether the convening authority impermissibly considered the race and gender of potential court members when detailing members to Appellant’s court-martial; (8) whether the military judge abused his discretion by admitting a redacted entry of judgment from Appellant’s prior court-martial ; (9) whether Appellant’s sentence is inappropriately severe; (10) whether the application of the 18 U.S.C. § 922 firearms prohibition to Appellant warrants correction; (11) whether the record of trial is incomplete; and (12) whether the search of Appellant’s phone violated his rights under the Fourth Amendment.4,5 In addition, although not raised by Appellant, we consider an

2 Unless otherwise noted, all references in this opinion to the UCMJ, the Rules for

Courts-Martial, and the Military Rules of Evidence (Mil. R. Evid.) are to the Manual for Courts-Martial, United States (2019 ed.). 3 U.S. CONST. amend. V.

4 U.S. CONST. amend. IV.

5 Appellant personally raises issue (12) pursuant to United States v. Grostefon, 12 M.J.

431 (C.M.A. 1982).

additional issue (13): whether Appellant is entitled to relief for facially unreasonable post-trial and appellate delay.

With respect to issue (10), we find no relief from this court is warranted.

See United States v. Johnson, __ M.J. __, No. 24-0004, 2025 CAAF LEXIS 499, at *14 (C.A.A.F. 24 Jun. 2025) (holding this court is not authorized to modify the 18 U.S.C. § 922 firearm prohibition indication on the staff judge advocate indorsement to the entry of judgment).

We have carefully considered issues (3) and (12) and find they warrant neither discussion nor relief. See United States v. Matias, 25 M.J. 356, 361 (C.M.A. 1987).

With respect to issue (1), we find relief is warranted with respect to the finding of guilty as to Specification 1 of the Charge, which we set aside, and as to the sentence, which we reassess. In light of our resolution of issue (1), we do not address issues (5), (6), or (9).

With respect to issue (8), we find error, and we have taken the potential prejudicial effect into account in our reassessment of the sentence.

With respect to the remaining issues, we find no further error that materially prejudiced Appellant’s substantial rights, and we affirm the findings of guilty as to Specification 2 and the Charge, and the sentence, as reassessed.

I. BACKGROUND

The case presently under review is Appellant’s second court-martial (Casillas II). In order to explain the course of that trial and the substance of several issues Appellant has raised on appeal, it is necessary to describe the relationship between Casillas II and Appellant’s first court-martial (Casillas I).6 An Internet service provider identified a commercial email account associated with Appellant as containing possible child pornography and contacted the National Center for Missing and Exploited Children (NCMEC). On 6 February 2020, NCMEC then contacted the Air Force Office of Special Investigations (OSI) regarding the account. The emails in question had been sent on or about 7 January 2020 between Appellant and another Air Force member, then- Master Sergeant AC, a married female servicemember stationed in Europe. At the time, Appellant was stationed in the Republic of Korea. On 24 March 2020, OSI agents brought Appellant to their detachment at Osan Air Base, Republic

6 The findings and sentence from Casillas I are presently and separately before this

court for review pursuant to Article 66, UCMJ, 10 U.S.C. § 866.

of Korea, for an interview.7 At that time the agents also seized Appellant’s cell phone, an iPhone XR. OSI sent Appellant’s phone to the Department of Defense Cyber Crimes Center (DC3) where a forensic analyst, Petty Officer First Class (PO1) IA, examined it.

OSI’s investigations disclosed substantial misconduct by both Appellant and AC.8 As a result, five charges and 22 specifications against Appellant were referred for trial by general court-martial (Casillas I). These specifications included , inter alia, one specification each of wrongfully possessing and wrongfully viewing child pornography on Appellant’s iPhone XR between on or about 1 December 2019 and on or about 24 March 2020, in violation of Article 134, UCMJ.

In November 2022, in preparation for a motions hearing related to Casillas I, trial counsel and PO1 IA, the DC3 forensic analyst, together reviewed evidence from Appellant’s phone. During their review, PO1 IA discovered additional images of suspected child pornography he had not previously detected. Specifically, PO1 IA found 13 images of suspected child pornography in a temporary directory for the Internet browser on Appellant’s phone. Analysis indicated the images had been stored in the temporary directory as portable document files (PDFs) on 6 and 7 January 2020.

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