On a sunny morning at Schriever Air Force Base, Colorado, groups and individual Airmen are warming up at the outdoor running track.
Off to the side, a quiet unassuming Airman puts on a pair of sunglasses and begins lightly jogging; the jog turns into a run and the run into nearly three miles of sprints. As others are gasping around him, 1st Lt. Nicholas Ruiz, executive officer with the 50th Mission Support Group, is barely sweating.
