A Vermont Air National Guard F-16 Fighting Falcon pilot assigned to the 158th Fighter Wing, Burlington Air National Guard Base, Vt., goes through pre-flight checks before a training mission during Red Flag 15-1 at Nellis Air Force Base, Nev., Feb. 4, 2015. Red Flag is an exercise hosted at Nellis AFB, Nev. that provides aircrews an opportunity to experience realistic, stressful combat situations in a controlled environment to increase mission capability. (U.S. Air Force photo by Senior Airman Thomas Spangler)