Tech. Sgt. Christopher Groessler, 62nd Maintenance Squadron munitions technician, practices kneeling behind a barricade during the 627th Security Forces Squadron’s Combat Arms Training and Maintenance class at Joint Base Lewis-McChord, Wash., Jan. 31, 2018. Airmen were required to fire in four positions to pass their qualification: prone with and without a prop, as well as kneeling and leaning against a barricade. (U.S. Air Force photo by Senior Airman Tryphena Mayhugh)