Tech. Sgt. Jeffery Self, 8th Security Forces Squadron team member, advances toward opposing forces during a training scenario at Kunsan Air Base, Republic of Korea, March 7, 2017.
Self used the advancing technique as part of exercise Beverly Pack 17-2, a no-notice training exercise used to improve responses to base threats. (U.S. Air Force photo by Tech. Sgt. Jeff Andrejcik/Released). Original public domain image from Flickr