Mark Atlow, wing exercise plans specialist for the 633rd Air Base Wing Plans and Evaluations office, shows a display that contains XP history Jan 25, 2013 at Langley Air Force Base, Va. Atlow plans natural disaster and major accident exercises to enable the preparedness of Joint Base Langley-Eustis personnel for numerous events. (U.S. Air Force Photo by Airman 1st Class R. Alex Durbin/Released)