U.S. Special Operation Forces ride snow-machine into a U.S. Air Force C-130 during Arctic Edge 18, March. 8, 2018, in Utqiagvik Alaska. Arctic Edge 2018 is a biennial, large-scale, joint-training exercise that prepares and tests the U.S. military’s ability to operate tactically in the extreme cold-weather conditions found in Arctic environments. Under the authority of the North American Aerospace Defense and U.S. Northern Command, more than 1500 participants from the Air Force, Army, Coast Guard, Marine Corps, and Navy will utilize the unique and expansive air and ground training areas in Alaska. (U.S. Air Force photo by Airman 1st Class Isaac Johnson)