Tech. Sgt. Zachary Lambert, 36th Operations Support Squadron NCO in charge of air traffic control training, explains the flight plan for an aircraft May 30, 2013, on Andersen Air Force Base, Guam. The air traffic controllers use the flight plan to track the movements of aircraft from each checkpoint to remain aware of aircraft locations. (U.S. Air Force photo by Airman 1st Class Emily Bradley/Released)