It was 50 years ago, but I still vividly recall the attack on Saigon. Like many others, I woke up in the South Vietnamese capital on Jan. 30, 1968 thinking that I heard firecrackers exploding to celebrate Tet, the Vietnamese Lunar New Year. But as I walked near the Saigon River waterfront, I realized that what I heard was automatic weapons fire, not firecrackers. In the predawn hours, Viet Cong and North Vietnamese troops had launched the Tet Offensive throughout South Vietnam. The Communist and South Vietnamese sides had separately announced that they would respect a two-day cease-fire for the Tet celebration. But the Communists had broken the truce.