An F-22 Raptor assigned to the 154th Wing, Hawaii Air National Guard, takes off from Nellis Air Force Base, Nev., during Red Flag 13-2 on Jan. 23, 2013. Red Flag is the largest and most complex full-scale Red Flag exercise to date. Each Red Flag exercise is an advanced aerial combat training opportunity that spans two weeks and is held at Nellis or Eielson Air Force Base, Alaska. The exercises host air crews from various U.S. and allied military units and air frames. (Courtesy photo/Glenn Bloore)