President Barack Obama speaks to a group of service members and honorary guests inside Hangar 3 at Joint Base Andrews, Md., March 31, 2010, about the Defense Department leading the way on energy security. On March 25, Air Force officials conducted a first-ever feasibility flight demonstration of an A-10C Thunderbolt II fueled with a blend of Hydrotreated Renewable Jet, or HRJ, and JP-8 at Eglin Air Force Base, Fla. (U.S. Air Force photo/Bobby Jones)