Master Sgt. Ryan O'Shea, loadmaster instructor for the 571st Mobility Support Advisory Squadron, inspects a Container Delivery System for proper knots prior to being loaded on a Colombian Air Force Casa 295 aircraft prior in preparation for the first air drop with United States Air Force personnel aboard on March 3, 2015 at Marandua Air Force Base in Colombia, South America. (Photo by U.S. Air Force Tech. Sgt. Matthew Hannen)