The Deputy Ambassadors and their periods of service in Vietnam are: U. Alexis Johnson (June 1964–September 1965), William J. Porter (September 1965–May 1967), Eugene M. Locke (May 1967–Jan 1968), Samuel D. Berger (March 1968–Mar 1972) Charles S. Whitehouse (March 1972–August 1973).
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