Ikaika Kang, 34, assigned to the 25th Combat Aviation Brigade, 25th Infantry Division, had been under investigation by the Army and FBI for more than a year and was taken into custody by FBI agents on Saturday, according to a bureau statement provided to Reuters.
According to a criminal complaint filed in US District Court in Honolulu, Kang has sworn allegiance to ISIS, also known as ISIS, the terrorist group that seized large swaths of territory in Syria and Iraq for a self-proclaimed caliphate.
He is also accused of attempting to provide military documents and training to the group, the FBI said in its statement.
Federal authorities believe that Kang, who was assigned to the Army's Schofield Barracks on the island of Oahu, was a 'lone actor' who had no known associations with anyone who might pose a threat to Hawaii, the FBI said.
He was slated to make an initial court appearance on Monday afternoon.
The Schofield Barracks, about 17 miles (27 km) from Honolulu, was established in 1908 as a garrison for the Army's defence of Pearl Harbor and the island of Oahu, and is home to more than 22,000 military personnel and family members.
The Army has sought to prevent a repeat of Islamist terrorist violence by one of its own since the 2009 shooting rampage at Fort Hood in Texas by then-Army Major Nidal Hasan, a US-born Muslim who killed 13 people and wounded 32 others in an attack he claimed as retribution for American wars in the Muslim world.
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