A U.S. Air Force F-22 Raptor, assigned to the 199th Fighter Squadron, Hawaii Air National Guard, flies away from a Wisconsin Air National Guard KC-135 Stratotanker aircraft Dec. 11, 2018, after receiving an air-to-air refueling during fighter-exercise Sentry Aloha near the Hawaiian Islands. Sentry Aloha provides tailored, cost effective and realistic combat training for U.S. Air Force, Air National Guard and other Department of Defense services to provide U.S. warfighters with the skill sets necessary to perform their homeland defense and overseas combat missions. (U.S. Air National Guard photo by Senior Airman John Linzmeier)