On August 26, 2015, Captain Matthew D. Roland, a special tactics officer (STO) assigned to the 23rd Special Tactics Squadron (23 STS), and Staff Sergeant Forrest B. Sibley, a combat controller (CCT) assigned to the 21st Special Tactics Squadron (21 STS), were wounded and killed in action (KIA) while attempting to pass through an Afghan Commando controlled security checkpoint that was located between Camp Bastion and Camp Antonik.