Defenders from the 841st Missile Security Forces Squadron prepare to breach a door Aug. 17, 2021, during a training exercise at the firing range village on Fort Harrison, Mont. The breach teams consisted of four defenders, who move through the building in specific formations to maximize vision and lethality. The training exercise is designed to teach defenders the proper technique of moving as a breaching unit, while simultaneously increasing confidence in stressful situations. (U.S. Air Force photo by Airman Elijah Van Zandt)