Which of the following president's is correctly paired with an event that took place during his administration

Richard M. Nixon is known to be the conversion of United States forces in Vietnam. Nixon was the President of the United States at 37th number from 1969 to 1974 at his retirement. He was the single president to retire from office. He had earlier worked as the 36th Vice President of the United States during the years 1953 to 1961.