Discovery Channel documentary series which examines the rigorous training soldiers must endure to become Special Forces personnel. From subsisting on only three hours of sleep and one meal a day for weeks on end to dragging 90 pound sacks into the Pacific Ocean, the courses examined in the series are among the toughest training regimes in the world. The episodes are: 'Ranger School', 'Air Force Pararescue', 'Special Forces Diver', 'US Marine Recon', 'Navy EOD' and 'Marine Sniper'.