In this Friday, March 8, 2013 photo, soldiers at Fort Riley, Kan., perform routine maintenance on a U.S. Army Black Hawk helicopter. Five U.S. soldiers based at Fort Riley, Kan., and one based in Europe were killed in a helicopter crash this week in southern Afghanistan, Army officials said Thursday, Dec. 19, 2013. The Army confirmed the soldiers died when their Black Hawk UH-60 went down Tuesday during a mission. One soldier survived the crash. (AP Photo/John Milburn)