On January 27, 1973, Henry Kissinger (then assistant to the President for national security affairs) agreed to a ceasefire with representatives of North Vietnam that provided for the withdrawal of American military forces from South Vietnam.
On Feb. 12, 1973, three C-141 transports flew to Hanoi, North Vietnam, and one C-9A aircraft was sent to Saigon, South Vietnam to pick up released prisoners of war.