U.S. Air Force Staff Sgt. Nicholas Barsenas, 36th Operation Support Squadron air traffic controller, speaks with pilots on July 17, 2017, at Andersen Air Force Base, Guam. Air traffic control Airmen assigned to the 36th Operation Support Squadron began work in the new tower cab here June 30 after spending almost three months working in the mobile tower unit on the flightline. (U.S. Air Force photo by Airman 1st Class Gerald Willis)