Airmen from the 60th Aerial Port Squadron and members of the Army National Guard's 49th Police Brigade practice loading and sling loading vehicles on a CH-47 Chinook cargo helicopter Oct. 14, 2015, at Travis Air Force Base, Calif. The units also practiced nighttime operations in total darkness with the aid of night vision goggles. (U.S. Air Force photo/T.C. Perkins Jr.)
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