For several months, a dank 6.5-by-7-foot cell at the Hanoi Hilton served as a crucible that tested the limits of human endurance for retired Air Force Col. Leon Ellis and three of his fellow prisoners.

Marine Who Was Held by Hanoi Found Not Guilty of All Charges (Jon M. Sweeney)
A young Long Island marine who spent 18 months as a prisoner of war was acquitted today of charges that he had run from his unit and, when captured, had made propaganda statements broadcast over the Hanoi radio. The decision freed Sgt. Jon M. Sweeney, 21 years old, of West
