U.S. Air Force Tech Sgt. Chris Giradeau, 81st Aerial Port Squadron Port Dawg Challenge participant, uses hand signals to guide Master Sgt. Seth Soine, 81st APS Port Dawg Challenge participant, out the back of a C-130 Hercules during an aerial port engine running on-load challenge at Dobbins Air Reserve Base, Ga., June 16, 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)