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English: A U.S. Air Force F-16 from the Colorado Air National Guard's 140th Wing taxis down the runway at Thule Air Base, Greenland, during North American Aerospace Defense Command's Arctic air defense exercise, Amalgam Dart 21-02, March 22, 2021. The exercise will run from March 20-26 and range from the Beaufort Sea to Thule, Greenland and extend south down the Eastern Atlantic to the U.S. coast of Maine. Amalgam Dart 21-02 provides NORAD the opportunity to hone homeland defense skills as Canadian, U.S., and NATO forces operated together in the Arctic. A bi-national Canadian and American 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, detect and defend against aerial threats that originate outside or within North American airspace. NATO E-3 Early Warning Aircraft, Royal Canadian Air Force CF-18 fighter aircraft, CP-140 long-range patrol aircraft, CC-130 Search and Rescue and tactical airlift aircraft, CC-150T air refueler, and CH-149 Cormorant Search and Rescue helicopters; as well as U.S. Air Force F-16 fighter aircraft, KC-10 Extender refueler, KC-46 Pegasus, KC-135 Stratotanker, as well as C-130 and C-17 transport aircraft will participated in the exercise. (U.S. Air Force photo by Lt. Col. Christopher Iavarone)