Master Sgt. Mark Hetzer, power production supervisor with the 911th Civil Engineer Squadron, and Staff Sgt. Nathan Patton, power production specialist with the 911th CES, work on a mobile aircraft arresting system during a training exercise at Fort Indiantown Gap, Pennsylvania, August 13, 2016. The two-day training exercise gave Airmen an opportunity to get hands-on training, rather than computer-based training, over their unit training assembly weekend. (U.S. Air Force photo by Airman 1st Class Beth Kobily