U.S. Air Force Airmen assigned to the 36th Operation Support Squadron work in the MSN-7 mobile tower unit parked on the flightline June 22, 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 Senior Airman Alexa Ann Henderson)