First Lt. Josh Fredrick holds maintenance checklists for a General Electric F101 engine being used for the initial testing of a 50-50 mix of Fisher-Tropsch and JP-8 jet fuels at Arnold Engineering Development Center, Arnold Air Force Base, Tenn. The new synthetic fuel will reduce U.S. dependency on foreign oil and increase our choices for fuel. (Air Force photo by Staff Sgt. Bennie Davis III)