The A-10C, one of the aircraft already tested for biofuel blends, has also been the focus of research for battle damage repair. The A-10's primary mission is to provide lethal, precision firepower in any potential close air support scenario. (U.S. Air Force photo/Staff Sgt. Chad Thompson)

Download Image: Full Size (1.37 MB)
Photo by:  |  VIRIN: 110421-F-XA056-012.JPG