A U.S. Army soldier stationed with the 25th Combat Aviation Brigade, 25th Infantry Division in Hawaii has been arrested on charges of providing material support to the Islamic State, according to a statement provided by the FBI on Monday.

Ikaika Kang, 34, a Sergeant First Class and Air Traffic Control Specialist, was taken into custody by a FBI SWAT team while in the Schofield Barracks in Honolulu on Saturday, after being under surveillance for nearly a year, according to FBI officials.

According to local media reports, the Army referred Kang to the FBI in August of 2016 after a history of threatening remarks and “pro-ISIS statements” dating back to 2011.  The Army’s concerns about Kang even resulted in his security clearance being suspended for a short time in 2012.

Kang, who had deployments to both Iraq and Afghanistan, is accused of conducting “military-style combat training” for a person whom he believed to be a member of ISIS.  Kang, who reportedly attained the highest level as an Army Combatives Trainer and has competed professionally as a mixed martial arts fighter, had the training sessions videotaped “so they could be used by ISIS to train other fighters,” according to the affidavit.