A $15,000 reward for information leading to Guillen’s whereabouts is being offered by CID, a tweet from Fort Hood said Monday.
Keys to her car and room were found in the armory where she was working earlier in the day along with her identification card and wallet, the release said.
Guillen, a private first class, was last seen wearing a black T-shirt, according to the release.
“An extensive search is underway by military members, as well as civilian and military police,” the release said.
Guillen is described as 5 feet 2 inches, 126 pounds with black hair and brown eyes.
Officials are asking anyone with information regarding Guillen’s whereabouts to call the Army CID special agents or military police.