U.S. Air Force Staff Sgt. Andrew Hester (left) and Master Sgt. Mark Compton (right), 96th Aerial Port Squadron Port Dawg Challenge participants, tighten the cargo hold chains while completing the cargo restraint challenge at Dobbins Air Reserve Base, Ga., June 17, 2015. The Port Dawg Challenge was created to enhance and maintain the camaraderie, esprit de corps and prestige of aerial port Airmen while promoting professionalism, leadership, training and communication between "Port Dawgs." (U.S. Air Force photo by Senior Airman Josh Slavin/Released)