A C-17 Globemaster taxis after being guided in for landing by the 321st Contingency Response Element aboard Al Taqaddum Air Base, Iraq, July 1, 2015. The 321st brings with it all the necessary elements for expeditionary airfield operations such as air traffic control, aerial porters and security forces who were instrumental in helping the Special Purpose Marine Air-Ground Task Force-Crisis Response-Central Command with the establishment of Task Force Al Taqaddum. (U.S. Marine Corps photo by Cpl. John Baker / RELEASED)