A B-52 Stratofortress accelerates down the runway at Edwards Air Force Base, Calif., Dec. 15 during take-off for a flight-test mission using a blend of synthetic fuel and JP-8 in all eight engines. This is the first time a B-52 has flown using a synfuel-blend as the only fuel on board. In September, the Air Force successfully flew a B-52 with two-engines using the synfuel-blend while the others used standard fuel. The B-52 test flights at Edwards are the initial steps in the Air Force process to test and certify a synthetic blend of fuel for its aviation fleet. (U.S. Air Force photo/Jet Fabara)