The FBI said Army soldier Ikaika Kang expressed his support of ISIS.

A 2016 undercover FBI operation at Fort Rucker, Alabama led to the arrest of a Hawaii Army soldier on charges of supporting ISIS.

Ikaika Erik Kang, a 34-year-old Army soldier stationed at Schofield Barracks in Hawaii, was arrested Saturday. Kang is an active duty air traffic controller assigned to the 25th Infantry Division at Wheeler Army Airfield in Hawaii.

The arrest came after more than a year of investigation by the Army and FBI.

According to court documents unsealed today, a major portion of that investigation took place at Fort Rucker in October 2016 when Kang was attending a six-week military training course for senior enlisted leaders. Alerted earlier in the year about Kang's alleged radicalization, the FBI obtained a warrant to search Kang's lodgings and computers at Fort Rucker.

The computers, according to the filing, contained 18 military documents labeled "secret," with files dating back to 2013. Investigators also found more than 2,000 videos, documents and graphics that referenced ISIS or violence.

A month later, an undercover FBI agent posted as guest lecturer at Fort Rucker and was introduced to Kang, later accompanying him to a mosque. The unsealed documents allege Kang told the undercover agent he wanted to travel to Turkey in order to reach the ISIS consulate.

"Kang further indicated he had not purchased an airline ticket (to Turkey because he believed he would be arrested," the documents said. "Kang said that he didn't want to do anything on the internet because he was afraid the FBI 'will show up at my door.

"Kang discussed the possibility of joining ISIS and fighting for ISIS. He told (the undercover agent at Fort Rucker) "people still say it's illegal to join them but the way I look at it they are just fighting the people who are committing genocide there. I'm just going to go there...and fight these guys who are committing genocide," Kang said, according to the documents.

Kang reportedly offered to assist the undercover agent by providing combat training to ISIS members.

Subsequent searches of Kang's computers and home in Hawaii revealed more ISIS-related material and classified military documents, according to the filing. Prosecutors later said he took an oath of loyalty to the Islamic terrorist group and expressed a desire to "kill a bunch of people."

Kang, who grew up in Hawaii, enlisted in the Army after the 9/11 attacks and served tours in Iraq and Afghanistan. He is also a mixed martial arts enthusiasts who had one professional fight in 2013, the FBI said.

He is charged with attempting to provide material support or resources to a foreign terrorist organization. A preliminary hearing was set for July 24.