Staff Sgt. Nicole Walker, a 424th Air Base Squadron air traffic controller, peers out the Chievres Air Base tower in Belgium, Feb. 26, 2016. The 424th ABS operates the airfield and runways at Chievres AB while providing support to the Supreme Allied Commander Europe and Supreme Headquarters Allied Powers Europe, NATO transient aircraft and distinguished visitors. (U.S. Air Force photo/Staff Sgt. Sara Keller)