Shooter's ready, fire!
U.S. Air Force Tech. Sgt. William Dunston prepares to load a 30 round magazine before qualifying on the M4 carbine at Howell Woods Firing Range in Smithfield, N.C., April 10, 2012. The M4 carbine is a gas-operated, air-cooled, magazine-fed, selective fire, shoulder-fired weapon with a telescoping stock commonly used by the U.S. military. Dunston, 4th Equipment Maintenance Squadron flightline munitions superintendent, hails from Philadelphia. (U.S. Air Force photo/Airman 1st Class Aubrey Robinson/Released)