Images of fanatical Viet Cong pouring out of the villages, jungles, and rice paddies hovered in the mind of each of us as we hunkered down for our first night of sleep in such supposedly hostile territory. That first night each new Marine and Corpsman counted the friendly faces of a handful of Americans, then looked with mixed emotions at a poorly equipped platoon of Vietnamese Popular Forces, the local village "militia".
Each Marine or Corpsman certainly pondered the distance to the nearest American military base. Each calculated how long it would take for help to arrive. Each knew that, when needed, help would probably not arrive in time.
Here is a contemporaneous film clip about the Combined Action Program: