Thong Nguyen, Progressive Combat Solutions instructor, explains the technique of a frontal charge advance to Staff Sgt. Andres Rojas, 6th Security Forces Squadron, MacDill Air Force Base (left) and Master Sgt. James Ashby, 99th Security Forces Squadron, Nellis Air Force Base, during an advanced tactical training course at the US Air Force Expeditionary Center, Joint Base McGuire-Dix-Lakehurst on April 14, 2015. Fifty Airmen from around the Air Force were chosen to attend a week long advanced weapons and tactics course as part of an initiative to increase the proficiency of Security Forces Defenders.(U.S. Air Force Photo by Danielle Brooks)