Staff Sgt. John Ayre, 60th Air Mobility Wing multimedia production section chief, prepares to film members of the 621st Contingency Response Wing, 60th Aerial Port Squadron and the California Army National Guard for joint sling-load training with a CH-47 Chinook and two Humvees Nov. 21, 2013, at Travis Air Force Base, California. (U.S. Air Force photo/T.C. Perkins Jr.)