Staff Sgt. Eric Mirabal, 161st Security Forces Squadron member, secures the perimeter and stands guard over the KC-135r tanker during a generation exercise, Phoenix Sky Harbor Air National Guard Base, April 6, 2014. This mobility exercise involves “fast response” techniques in order to ensure the aircrew can react quickly and effectively when missions require a moment’s notice. (Air National Guard photo by Staff Sgt. Courtney Enos)