French soldiers fire a French TRF1 155 mm self-propelled howitzer as part of a live fire exercise during Combined Endeavor at the Joint Multinational Training Command's Grafenwoehr Training Area, Germany, Sept. 17, 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 Gertrud Zach/Released)