An F-22 Raptor assigned to the Hawaii Air National Guard's 154th Wing takes off Jan. 23, 2013, from Nellis Air Force Base, Nev., during Exercise Red Flag 13-2. 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. (Leading Edge Images photo by Glenn Bloore)