Video: 'The President: March 1968. MP894.' (Mar. 1, 1968, at 1:25)

(Friday, March 1, 1968, 12 noon EST; during the Vietnam War, part of the Indochina Wars and the Cold War) — Clark Clifford, a Washington lawyer and adviser to Democratic presidents for two decades, was sworn in today succeed Robert McNamara as the U.S. Secretary of Defense in a White House East Room ceremony with President Lyndon Johnson in attendance.

Video: 'Our World Winter 1968 Part 3' (Mar. 1, 1968, at 4:18)

Video: 'American Experience LBJ 2' (Mar. 1, 1968, at 1:25:41)

Video: 'Vietnam: A Television History - Tet [6/11]' (Mar. 1, 1968, at 33:16)

Video: 'Vietnam: The Ten Thousand Day War - America in Vietnam [1/13]' (Mar. 1, 1968, at 30:42)

Video: 'Vietnam: The Ten Thousand Day War - Tet! [7/13]' (Mar. 1, 1968, at 44:18)