Posted: 09/01/2013
An RQ-4 Global Hawk taxies on the flightline as a U-2 makes its final approach Sept. 17, 2013, at Beale Air Force Base, Calif. The RQ-4 and U-2 are the Air Forces primary high-altitude intelligence, surveillance and reconnaissance aircraft. (U.S. Air Force photo/Airman 1st Class Bobby Cummings)
