Staff Sgt. Christopher Palacio, 374th Operations Support Squadron air traffic control specialist, operates an approach control station as he separates, sequences and directs aircraft into five different Japanese and U.S. military bases throughout the region at Yokota Air Base, Japan, May 8, 2015. Palacio works in the radar approach control section of the tower, which can monitor and control aircraft in an area of 20,000 square miles. (U.S. Air Force photo by Senior Airman Michael Washburn/Released)

A computer monitor in the radar approach control section of the air traffic control tower at Yokota Air Base, Japan, displays all the incoming and outgoing aircraft near Yokota and surrounding areas May 8, 2015. From this section in the control tower, RAPCON Airmen are able to monitor aircraft from ground level to altitudes of 23,000 feet. (U.S. Air Force photo by Senior Airman Michael Washburn/Released)

A panoramic photo shows the radar approach control section of the air traffic control tower at Yokota Air Base, Japan, May 8, 2015. (U.S. Air Force photo by Senior Airman Michael Washburn/Released)

Tech. Sgt. Charmaine Johnson, 374th Operations Support Squadron tower watch supervisor, monitors the two staff sergeants working in the control tower at Yokota Air Base, Japan, May 8, 2015. Johnson’s role is to ensure that all rules and regulations are followed during tower procedures. (U.S. Air Force photo by Senior Airman Michael Washburn/Released)

Staff Sgt. Randall Vaughn, 374th Operations Support Squadron radar approach control supervisor, touches his personalized headset at the air traffic control tower at Yokota Air Base, Japan, May 8, 2015. Vaughn uses the headset to talk to incoming and outgoing aircraft at Yokota. (U.S. Air Force photo by Senior Airman Michael Washburn/Released)

Tech. Sgt. Charmaine Johnson, 374th Operations Support Squadron tower watch supervisor, uses a pair of binoculars to monitor flightline activity from the air traffic control tower at Yokota Air Base, Japan, May 8, 2015. In addition to communicating with aircraft, controllers operate the lights for the flightline and overruns. (U.S. Air Force photo by Senior Airman Michael Washburn/Released)

From left to right, Staff Sgts. Randall Vaughn, Johnathan Camp and Tech. Sgt. Charmaine Johnson, 374th Operations Support Squadron watch supervisors, work the tower cab section of the air traffic control tower at Yokota Air Base, Japan, May 8, 2015. The tower cab can handle aircraft within five nautical miles. (U.S. Air Force photo by Senior Airman Michael Washburn/Released)

A panoramic photo shows the tower cab section of the air traffic control tower at Yokota Air Base, Japan, May 8, 2015. (U.S. Air Force photo by Senior Airman Michael Washburn/Released)