Rounds from a simulated M-4 Carbine virtually penetrate a target on an engagement skills trainer at the Combat Arms Training Range, July 9, 2013, Eielson Air Force Base, Alaska. After completing classroom training, Airmen have the opportunity to hone their shooting skills using an engagement skills trainer. The system provides an effective, cutting edge learning experience before stepping foot on a live-fire range. (U.S. Air Force photo by Senior Airman Shawn Nickel/Released)