The Viet Cong have promised to celebrate the fifth anniversary of their "National Liberation Front" this week with a major act of terrorism against Americans in downtown Saigon. Since in the past the Viet Cong have very often proved as bad as their word, Saigon last week wore a look of siege amidst the festoonery of Christmas. Police guards were doubled around the main hotels and military installations, and white wooden barriers blocked off many streets—including the one on which General William C. Westmoreland's house is situated.
Christmas trees were checked for explosives before they were allowed into U.S. billets,...