The Thunderbirds perform the calypso pass, an aerobatic maneuver, during the 2015 Dakota Thunder airshow and open house at Ellsworth Air Force Base, S.D., Aug. 15, 2015. Each Thunderbird F-16 Fighting Falcon is assigned a crew chief and an assistant crew chief to ensure their jet remains mission-ready. (U.S. Air Force photo by Airman Sadie Colbert/Released)