In support of the North American Aerospace Defense and Command (NORAD) and U.S. Northern Command (USNORTHCOM) homeland defense missions, Continental U.S. NORAD Region – 1st Air Force (Air Forces Northern) achieved a first-ever milestone June 16 when U.S. Air Force Airmen assigned to the 140th Wing, Buckley Space Force Base, Aurora, Colo., and the 4th Airlift Squadron, McChord Air Force Base, Wash., performed a C-17 wet-wing refueling during exercise Amalgam Dart 21-01 at Thule Air Base, Greenland.