Tech. Sgt. Chad Thompson, 36th Operations Support Squadron tower watch supervisor, watches over a virtual layout of the flightline at Andersen Air Force Base, Guam, July 20, 2012. The virtual layout is within a virtual air traffic control tower simulation that allows controllers to hone in on the skills required to control a busy flightline. (U.S. Air Force photo/Senior Airman Carlin Leslie/Released)