Square protractor
U.S. Air Force 1st Lt. Jessica Terrell, 1st Special Operations Maintenance Squadron munitions accountable systems officer from Hurlburt Field, Fla., calculates a route to take using a map and military-square protractor during a land navigation exercise for the air liaison officer training course at Moody Air Force Base, Ga., Aug. 2, 2011. The military protractor contains two scales with a printed formula and diagram to align map grids. (U.S. Air Force photo by Airman 1st Class Joshua Green/Released)
PHOTO BY:
Airman st Class Joshua GreenReleased
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