U.S. Air Force Tech. Sgt. Shawn Leonard, 9th Air Support Operations Squadron joint terminal attack controller instructor, Fort Hood, Texas, observes Airmen clear a stairwell in urban close combat training class during exercise Allied Strike 10, Grafenwoehr, Germany, July 26, 2010. AS10 is Europe's premier close air support (CAS) exercise, held annually to conduct robust, realistic CAS training that helps build partnership capacity among allied NATO nations and joint services while refining the latest operational CAS tactics. For more Allied Strike information, visit www.usafe.af.mil/alliedstrike.asp. (U.S. Air Force photo by Senior Airman Caleb Pierce)