50/50
DYESS AIR FORCE BASE, Texas-- Staff Sgt. Alex Speener, B-1 Crew Chief, awaits the ok to attach fuel lines containing a 50/50 blend of synthetic and petroleum to a B-1 Bomber, March 17. The Air Force is currently in the process of evaluating and certifying this alternative fuel, derived from natural gas using the Fischer-Tropsch process, for all Air Force aircraft. (U.S. Air Force photo by Senior Airman Courtney Richardson)