Mr. David Leventhal, an explosives ordnance disposal instructor, shows security forces students what signs to look for if an improvised explosives device is placed on their convoy route during a training exercise on a range on Joint Base McGuire-Dix-Lakehurst, N.J., on Aug. 26, 2009. The training is conducted by the 421st Combat Training Squadron of the U.S. Air Force Expeditionary Center. (U.S. Air Force Photo/Tech. Sgt. Paul R. Evans)