Graham Martin succeeded Ellsworth Bunker as U.S. ambassador to South Vietnam in 1973. He would be the last person to hold that position. Martin, along with the last remaining Americans, was evacuated by helicopter from Saigon as Communist forces overran the city in April, 1975.
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... between the axis and the groove rims will accelerate or brake the spinning gyroscope, with a maximum effect when the axis starts "rolling" inside the groove. (Compare with ...