4th CES EOD open house
U.S. Air Force Staff Sgt. Adam Usher tapes C-4, a plastic explosive, to a safe at the explosive ordnance disposal range on Seymour Johnson Air Force Base, N.C., April 24, 2012. C-4 has a detonation velocity of 26,550 feet per second, making it a reasonable means to open the safe. Usher, 4th Civil Engineer Squadron EOD apprentice, hails from Langhorne, Pa. (U.S. Air Force photo/Airman 1st Class Aubrey Robinson/Released)