Alpha Company, 1st Battalion, 279th Infantry Regiment of the Oklahoma National Guard, Sand Springs, Okla., practice live-fire drills at the Camp Grayling Aerial Gunnery Range, Grayling, Mich., July 23, 2019, during exercise Northern Strike 19. Northern Strike (NS) 21-2, one of the Department of Defense’s largest reserve component readiness exercises, is scheduled to take place across Northern Michigan July 31 to August 14.