Security forces Airmen train on the U.S. Army's Blue Force Tracker system on Aug. 29, 2009, during their pre-deployment training at the U.S. Air Force Expeditionary Center's 421st Combat Training Squadron at Joint Base McGuire-Dix-Lakehurst, N.J. The Blue Force Tracker is a system that gives air and ground units and their commanders a real-time picture of the battlefield. (U.S. Air Force Photo/Tech. Sgt. Paul R. Evans)