U.S. Air Force Airman Dylan Coady, 633rd Security Forces Squadron installation entry controller, fires paint rounds out of an M-4 carbine during emergency service team tryouts at Langley Air Force Base, Va., Jan. 20, 2015. Air Force EST’s are similar to special weapons and tactics teams as they may be called on to handle high-risk situations on installations. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)