Dustoff 7-3 tells the true story of four unlikely heroes in the rugged mountains of Afghanistan, where medics are forced to descend on wires to reach the wounded and helicopter pilots must fight wind, weather, and enemy fire to pluck casualties from some of the world's most difficult combat arenas. Complete opposites thrown together, cut off, and outnumbered, Chief Warrant Officer Erik Sabiston and his flight crew answered the call in a race against time, not to take lives--but to save them.   The concept of evacuating wounded soldiers by helicopter developed in the Korean War and became a staple during the war in Vietnam where heroic, unarmed chopper crews flew vital missions known to the grateful grunts on the ground as Dustoffs.   The crew of Dustoff 7-3 carried on that heroic tradition, flying over a region that had seen scores of American casualties, known among veterans as the Valley of Death. At the end of Operation Hammer Down, they had rescued 14 soldiers, made three critical supply runs, recovered two soldiers killed in action, and nearly died. It took all of three days.