SFC Antonio Arellano, center, and SFC David Stegman of U.S. Army Europe’s 19th Battlefield Coordination Detachment review targeting information using a Defense Advanced GPS Receiver during a multinational artillery live-fire exercise in Baumholder, Germany, June 20, 2013. DOD has invested in a number of areas to preserve critical capabilities, including GPS-related technologies. (Photo by SGT Daniel Cole, U.S. Army Europe Public Affairs)