STK104453MSpecial forces soldier enters coordinates into his GPS device.
STK104454MU.S. Air Force engineer using global positioning system-based survey equipment.
STK104456MSoldiers complete land navigation training at Elmendorf Air Force Base, Alaska.
STK104457MU.S. Marine using GPS capabilities on a handheld device to check his location.
STK104458MU.S. Air Force a pilot uses his Global Positioning System to check his position.