Planes over water

AIR FORCE PHOTOS

Maj. Benjamin Calhoon, the chief of the Positioning, Navigation and Timing Branch within the Space Operations Division of Headquarters Air Force, gives a GPS lecture at the Smithsonian’s National Air and Space Museum in Washington D.C., July 17, 2015. The Air Force celebrated the 20th anniversary of the GPS. (U.S. Air force photo/Staff Sgt. Whitney Stanfield)

PHOTO BY: Whitney Stanfield
VIRIN: 150717-F-JA180-004.JPG
FULL SIZE: 0.43 MB
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