Crew chiefs to co-pilots
Air Force Staff Sgt. Joshua Thompson, 509th Aircraft Maintenance Squadron dedicated crew chief, signs out flight equipment prior to being an incentive rider on a B-2 Spirit at Whiteman Air Force Base, Mo., July 10, 2015. Before flying, Thompson, along with two other dedicated crew chiefs, attended briefings, Aerospace Physiology Training and received flight physicals. (U.S. Air Force photo by Senior Airman Joel Pfiester/Released)