U.S. Air Force Staff Sgt. Clifford Mapp, an air

U.S. Air Force Staff Sgt. Clifford Mapp, an air transportation specialist with the 436th Aerial Port Squadron (APS), measures cargo during the Port Dawg Challenge (PDC) April 25, 2019, at Dobbins Air Reserve Base, Georgia. The PDC is Air Force Reserve Command's premier aerial port competition created to promote professionalism, demonstrate global mission capabilities and help identify best practices to improve wartime readiness. The 436th APS is an active-duty Air Force unit out of Dover Air Force Base, Delaware. This was the first time active-duty teams participated in the PDC. (U.S. Air Force photo by Tech. Sgt. Jamal D. Sutter)