Tech Sgt. Lance Bollenberg, 28th Security Forces Squadron noncommissioned officer in-charge of physical security, fires an M320 grenade launcher during a course in preparation for the 2021 Global Strike Challenge at Ellsworth Air Force Base, S.D., Aug. 23, 2021. During the competition, Airmen must compete in seven categories to include munitions, bomber maintenance and intercontinental ballistic missile operations. (U.S. Air Force photo by Senior Airman Alexi Bosarge)