Airman 1st Class John Porter, 2nd Operations Support Squadron air traffic controller, reaches for an entry authorization list on Barksdale Air Force Base, La., July 11, 2013. The access list is used to inform air traffic controllers on who is authorized to enter the control tower. (U.S. Air Force photo/Airman 1st Class Andrew Moua)
Airman 1st Class John Porter, 2nd Operations Support Squadron air traffic controller, observes B-52H Stratofortress bombers on the flightline on Barksdale Air Force Base, La., July 11, 2013. Porter's duties as an air traffic controller include directing and guiding Barksdale's fleet of B-52H Stratofortress bombers, observing weather conditions and assisting in airfield management. (U.S. Air Force photo/Airman 1st Class Andrew Moua)
Airman 1st Class Dustin Reinhart, 2nd Operations Support Squadron air traffic controller, uses a two-way radio on Barksdale Air Force Base, La., July 11, 2013. The radio is used to communicate with ground crew such as maintainers and crew chiefs assisting in the launch of an aircraft. (U.S. Air Force photo/Airman 1st Class Andrew Moua)
B-52H Stratofortress bombers sit on the flightline at Barksdale Air Force Base, La., July 11, 2013. Air traffic controllers guide the bombers to their parking spots on the flightline. (U.S. Air Force photo/Airman 1st Class Andrew Moua)
Airmen 1st Class John Porter and Dustin Reinhart, 2nd Operations Support Squadron air traffic controllers, discuss radar information, on Barksdale Air Force Base, La., July 11, 2013. Air traffic control Airmen use the radar information to keep track of weather patterns and other aircraft in the sky. (U.S. Air Force photo/Airman 1st Class Andrew Moua)
Tracy Brittan, center, 2nd Operations Support Squadron watch supervisor, discusses training records with Staff Sgts. Katelyn Vargas and Nicole Depew, 2nd OSS watch supervisors, on Barksdale Air Force Base, La., July 11, 2013. Airmen begin a year-long training process as watch supervisors once they attain the rank of Staff Sergeant, enabling them to supervise all positions within the control tower, separate arrivals and departures and provide advice in unsafe situations. (U.S. Air Force photo/Airman 1st Class Andrew Moua)
Senior Airman Anthony Scuteri, 2nd Operations Support Squadron air traffic controller, tests a light-gun on Barksdale Air Force Base, La., July 11, 2013. The light-gun is used when radio communications have failed or cannot be used, and signals air and ground crew with colored lights that signify different instructions. (U.S. Air Force photo/Airman 1st Class Andrew Moua)