In the past decade there have been five major rescue attempts, including two U.S. efforts, similar to the one mounted in Iran. All were risky; none was an unqualified success. Those that worked best took place in relatively isolated areas and were total surprises, which enabled the attackers to overpower their foes quickly. The missions:
November 1970: On orders of President Nixon, about 100 crack commandos choppered to the Son Tay prison camp near Hanoi to free 70 American prisoners of war thought to be held there. But all the raiders managed to do was dumbfound half a dozen North Vietnamese guards....