LANGLEY AIR FORCE BASE, Va. -- Lt. Col. Robert Sandford, 192d Fighter Wing chief of standardization and evaluation, taxis in an F-22 Raptor after surpassing 4,000 flight hours, May 17. Colonel Sandford amassed the milestone flight time throughout 24 years, flying A-7 Corsairs, F-16 Fighting Falcons and F-22 Raptors. (U.S. Air Force photo/Airman 1st Class Gul Crockett)