available light
A soldier from the Army National Guard plots the points on his map using available light during the twilight land-navigation course at the 2015 Best Warrior Competition at Camp Swift, Texas, Feb. 7, 2015. The course started at 5a.m. and finished at daybreak. The competition determines the best of the best warrior amongst Army and Air National Guardsmen. (photo by Master Sgt. Charles Hatton/released)

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Photo by: Master Sgt. Charles Hattonreleased |  VIRIN: 150207-Z-SL703-008.JPG