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In retirement, he served President Reagan and his successors, Presidents George Bush and William J. Clinton, as a special emissary to Vietnam on the question of American service personnel missing from the Vietnam War.
He toured South America, the Far East, the Pacific Region, the Soviet Union, and Europe numerous times, but held a particular interest in Southeast Asia; meeting with the Laos government in 1989 and, later, the Vietnamese government in 1990, to obtain information on American POW/MIA's in Southeast Asia.