Airmen from the 455th Expeditionary Aerial Port Squadron, Bagram Air Field, Afghanistan, and the 60th Air Mobility Wing, Travis Air Force Base, Calif., load MRAP All-Terrain Vehicles onto a C-17 from McChord Air Force Base, Wash., Aug. 11, 2014. Air mobility is a key part of Operation Enduring Freedom’s ongoing retrograde of people and equipment throughout Afghanistan as Dec. 31, 2014, approaches. Bagram Air Field is the busiest aerial port in the Department of Defense. (U.S. Air Force photo by Maj. Brandon Lingle/Released)