U.S. Air Force Captain Betsy Mayes, 349th Aeromedical Evacuation Squadron flight nurse, treats a simulated patient during an aeromedical mission at Tinian, U.S. Commonwealth of the Northern Mariana Islands, during exercise COPE NORTH 18, Feb. 19. Approximately 3,000 personnel are participating in COPE NORTH 18, including members of the United States Air Force, United States Navy, United States Marine Corps, Koku Jieitai (Japan Air Self Defense Force) and Royal Australian Air Force. (U.S. Air Force photo by Staff Sgt. Corey Hook)