U.S. Air Force AIRMAN Matthew Bernard (foreground) wears a water filled mask while performing over one thousand flutter kicks after 20 hours of non-stop physical training during an extended training day at the Pararescue Indoctrination Training Center, Medina Annex, Lackland Air Force Base, Texas, April 6, 2006. (U.S. Air Force photo by TECH SGT. Cecilio M. Ricardo, Jr.) (Released)