A U.S. Air Force pilot assigned to the 55th Fighter Squadron taxis onto the runway in preparation for a nighttime flying mission in support of Red Flag 17-2 at Nellis Air Force Base, Nev., Feb. 28, 2017. In addition to daytime operations, Red Flag conducts training exercises during hours of darkness to train for low-visibility environments. (U.S. Air Force photo by Senior Airman Zade Vadnais)