Airmen with the 820th RED HORSE Squadron airborne flight, out of Nellis Air Force Base, Nev., take a knee as a CH-47 Chinook from the Army National Guard, Stockton, Calif., recovers an aircraft part during a recovery and clean-up operation Nov. 9, 2011, in the Nevada Test and Training Range. An F-15 crashed Oct. 24, 2011, northwest of Alamo, Nev., and the Safety Investigation Board had been examining the scene since the incident occurred. (U.S. Air Force photo/Airman 1st Class Daniel Hughes)