John T. Booker, a 20-year-old man from Topeka, Kansas, has been arrested following an FBI investigation that began last year. Booker reportedly joined the U.S. Army last year, he admitted, specifically so that he could launch a Fort Hood-style attack on American soldiers. He was due to report for basic training on Tuesday.

Booker caught the attention of the FBI last year after allegedly posting alarming content to his FaceBook page, reported to them by an unidentified source. One of those posts read:

“Getting ready to be killed in jihad is a HUGE adrenaline rush!!” he allegedly posted on March 19, 2014. “I am so nervous. NOT because I’m scared to die but I am eager to meet my lord.”

More, from ABC News:

The next day, FBI agents approached Booker and interviewed him, according to court documents. In that interview, he admitted he enlisted in the U.S. Army months earlier with the intent to commit an insider attack on American forces like the Ft. Hood in 2009, when Maj. Nidal Hassan killed 13 and injured dozens more, court documents show.

Seven month later, an FBI informant began engaging with Booker, and during those conversations Booker “repeatedly expressed his desire to engage in violent jihad on behalf of [ISIS],” the FBI alleges in court documents.

Specifically, on Oct. 10, 2014, Booker told the FBI informant he “joined the United States Army” and “was going to go in there and kill the American soldier,” the court documents say.

“Booker stated that he formulated several plans for committing jihad once enlisted, including firing at other soldiers while at basic training at the firing range or while at his pre-deployment military base after completing his initial military training,” according to the court documents. “Booker clarified that he did not intend to kill ‘privates,’ but that he instead wanted to target someone with power.”