A CH-47 Chinook transports U.S. Marines during a joint

A CH-47 Chinook transports U.S. Marines during a joint live-fire training exercise at Fort Greely, Alaska, March 15, as part of the U.S. Army Alaska-led Joint Force Land Component Command in support of Alaskan Command's exercise Arctic Edge 18 conducted under the authority of U.S. Northern Command. 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. (U.S. Air Force photo by Capt. Virginia Lang)