U.S. Air Force Col. Christopher Brooks, the U.S. Delegation chief, and U.S. Service Members stand in formation for opening ceremonies of exercise Combined Endeavor 2013 at the Joint Multinational Training Command in Grafenwoehr, Germany, Sept. 12, 2013. Combined Endeavor is an annual command, control, communications and computer systems (C4) exercise designed to prepare international forces for multinational operations in the European theater. (U.S. Army photo by Spc. Franklin Moore/Released)