Lead: For 400 years service men and women have fought to carve out and defend freedom and the civilization we know as America. This series on A Moment in Time (is presented by the people of _________ and) is devoted to the memory of those warriors, whose sacrifice gave, in the words of Lincoln at Gettysburg, the last full measure.

Content: Connecting Phnom Penh, Cambodia to Ho Chi Minh City, formerly Saigon, Highway Number One meanders along the coastline of Vietnam until it reaches Hanoi in the north. Just few miles west of the former capital of the South, the highway bisects one of the most contested provinces of the two wars for Vietnam. Cu Chi province lies on the piedmont or Mekong terrace, between the dry foothills of the central highlands and the rich swampy rice fields of the Mekong Delta. One of the few places in South Vietnam where troops and armor could operate nearly all year long, it was like a dagger pointed at the heart of the South’s nerve center.