U.S. Air Force Airmen assigned to the 140th Wing and 4th Airlift Squadron preform a wet-wing defuel during exercise Amalgam Dart 21-01, June 16, 2021 at Thule Air Base, Greenland. Exercise Amalgam Dart will run from June 10-19, 2021, with operations ranging across the Arctic from the Beaufort Sea to Thule, Greenland. Amalgam Dart 21-01 provides NORAD the opportunity to hone continental defense skills as Canadian and U.S. forces operate together in the Arctic. A bi-national Canadian and Ameican command, NORAD employs a network of space-based aerial and ground-based sensors, air-to-air refueling tankers, and fighter aircraft, controlled by a sophisticated command and control network to deter, deny and defeat aerospace threats that originate outside or within our borders. (U.S. Air National Guard photo by Airman Mira Roman)