LANGLEY AIR FORCE BASE, Va. – Staff Sgt. Marquin King, 633d Security Forces Squadron active shooter instructor, detains Senior Airman Patrick McCoy, 633 SFS Combat Arms Training and Maintenance instructor, during the L-shaped formation training Jan. 26. Security forces use hands-on training to prepare Airmen for on-the-job scenarios. (U.S. Air Force photo/Airman 1st Class Racheal Watson)(RELEASED)