Staff Sgt. Matthew McClintock, 30, died from wounds suffered when the enemy attacked his unit with small arms fire, according to the DoD announcement released late Wednesday.

The incident is under investigation.

McClintock, of Albuquerque, New Mexico, was assigned to 1st Battalion, 19th Special Forces Group, in Buckley, Washington.

McClintock and his fellow Green Berets, from 1st Battalion’s A Company, deployed to Afghanistan in July, according to information from the Washington Army National Guard.

McClintock joined the Army in 2006. After completing his training, McClintock was assigned to the 1st Cavalry Division, deploying to Iraq in 2007.