FORT CAMPBELL, Ky. — A U.S. Army staff sergeant who previously competed in military culinary competitions and participated in competitive Pokémon tournaments was sentenced to 10 years in military prison after pleading guilty to sexual assault of a child and possession of child pornography.
Staff Sgt. Nelson E. Guillen was convicted on November 5, 2026, during a general court-martial at Fort Campbell, Kentucky, according to the Army’s public military justice docket.
Guillen pleaded guilty to one specification of sexual assault of a child under Article 120b of the Uniform Code of Military Justice and one specification of possession of child pornography under Article 134.
Military Judge John R. Longley III sentenced Guillen to 10 years of confinement and a dishonorable discharge. The Army reported that the sentence was consistent with the terms of a plea agreement.
The publicly available court-martial summary does not identify the victim, provide the dates or locations of the offenses, or disclose the circumstances surrounding the investigation.
Before his conviction, Guillen had been publicly recognized as a participant in one of the Army’s culinary competitions.
In September 2024, Guillen competed in the I Corps Chef of the Year Competition at Joint Base Lewis-McChord, Washington. The three-day event tested Army culinary specialists on military skills, food-service knowledge, and cooking ability.
An Army article published on September 26 featured a photograph of Guillen preparing a meal during the competition’s timed cook-off.
Social media posts suggest that Guillen attended Air Assault School in July 2019 and trained at Fort Irwin in 2025.
The profile’s connection to the convicted staff sergeant is supported by the name, military imagery, and occupational details, although the account’s ownership has not been independently authenticated through Army records.
Outside the military, his social media activity documents an extensive interest in competitive Pokémon trading card tournaments.
In an October 15, 2023, post, the account described finishing 17th out of more than 1,400 competitors at the Sacramento Pokémon Regional Championships.
“I don’t really share my pokemon hobby here but this weekend went great for me,” the post stated.
The account reported a tournament record of 10 wins, two losses, and three ties, earning $1,000 in prize money and championship points.
Other posts document participation in additional regional competitions.
In May 2024, the account reported finishing 52nd out of 2,094 competitors at an event in Los Angeles.
A November 2024 photograph shared by Graceful Gaming showed three players at the Sacramento Pokémon Regional Championships. The accompanying caption identified a player named Nelson and listed a 402nd-place finish among 1,705 Masters Division competitors.
On November 3, 2026, two days before the court-martial, a Facebook account named Nelson Guillen joined a group called “Fort campbell NO Rules Sale Page” and advertised U.S. Army uniform tops.
The listing described authentic Operational Camouflage Pattern uniform jackets in size extra-small regular.
The post included information about the garments’ ripstop material, rank and name-tape attachments, and other military uniform features.
Around the same period, the account also advertised a used Nintendo Switch with neon pink and green Joy-Con controllers and physical copies of Pokémon Legends: Arceus and Pokémon Brilliant Diamond.
Another listing advertised a black ASUS E510 laptop with an Intel Celeron processor, a numeric keypad, and a screen capable of opening flat to 180 degrees. It is not known whether the laptop was involved in the child sexual abuse material (CSAM) investigation.
The advertisements appeared shortly before the November 5 guilty plea and sentencing.
The timing raises the possibility that the account holder was preparing to part with personal belongings ahead of confinement, although the posts themselves do not establish the reason for the sales.
The Army’s court-martial summary confirms that Guillen’s sentence was consistent with a plea agreement, but it does not disclose when the agreement was finalized or whether Guillen knew he would receive exactly 10 years before appearing in court.
Military plea agreements can establish sentencing limitations or specific sentencing terms. Without Guillen’s agreement, it is not possible to determine what sentence he anticipated when the items were advertised.
There is also no evidence in the available court-martial summary connecting the advertised laptop, Nintendo Switch, or Pokémon hobby to the offenses for which Guillen was convicted.
Despite the guilty plea and substantial prison sentence, the Army’s publicly available court-martial record provides few details about the criminal conduct.
The record does not identify the victim’s age, the circumstances of the sexual assault, or the nature and quantity of the child pornography involved.
It also does not establish whether the investigation originated with Army criminal investigators, civilian law enforcement, or another agency.
A search of publicly indexed civilian court and arrest information in Washington, Kentucky, and Tennessee did not identify a corresponding case that could be reliably attributed to Guillen. That finding does not rule out a civilian investigation or records unavailable through publicly indexed sources.
The underlying charge sheet, plea agreement, and other military court documents could provide additional information about the offenses and the investigation that led to Guillen’s conviction. The Salty Soldier is seeking these records to provide greater transparency about the crimes committed by Guillen, the circumstances surrounding the offenses, and the military’s handling of the case.
For now, the Army’s official disposition is clear: Guillen pleaded guilty to sexually assaulting a child and possessing child pornography, and a military judge sentenced him to a decade of confinement and a dishonorable discharge.
Just two days before that sentencing, a Facebook account bearing his name was advertising extra-small Army uniforms for sale near Fort Campbell.
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