November 1967 report to LBJ by Bunker; Bob Komer and General Westmoreland; pacification progress and military situations; 1968 Tet offensive; Bunker's reputation that the U.S. had prior knowledge of the timing of the offensive; Bunker's impression that offensive was a deafeat for North Vietnam; Westmoreland's request for additional troops and Bunker's disagreement; defense of Phoenix program (identifying subversives); official visitors to Vietnam, 1967-1968