Staff Sgt. Nicholas Niles, 2nd Security Forces Squadron Combat Arms instructor, listens to a pre-mission brief for a combat training simulator at Barksdale Air Force Base, La., Jan. 30. The combat simulator is capable of supporting various weapon systems such as the M-9 Beretta, M-4 carbine rifle, M-16A2 rifle and the M-249B light machine gun. (U.S. Air Force photo/Airman 1st Class Micaiah Anthony)(RELEASED)