Staff Sgt. Sean Hornaday, 11th Security Forces Group Combat Arms Training and Maintenance instructor fires an M240B on top of a HMMWV during heavy weapons qualification Mar. 4, 2013, at Marine Corps Base Quantico firing range, Quantico, Va. SF Airmen qualify in heavy weapons as part of pre-deployment training. (U.S. Air Force photo by Staff Sgt. Perry Aston)