Yet, from its start, the Vietnam War was unlike the previous American wars: There was no real front; the enemy could be anywhere; and most importantly, they didn’t always fight like a conventional army in the mountains, jungles, or rice paddies.

The Americans were fighting a limited war, trying to keep North Vietnam from infiltrating or taking over the South. They were also using a data-driven — but flawed — bombing campaign and other operations based on pursuing and exploiting the fears and beliefs of the North Vietnamese.

Enter Major David Hackworth.

Hackworth was tasked with creating an elite commando unit from the already elite Special Forces long-range reconnaissance patrol units. The unit, which he would call Tiger Force, was to do more than just gather intelligence. As he put it, he wanted to “out-guerrilla the guerrillas.”