Why is "Grunts Vocabulary Primer" important to understanding the soldier's role in Vietnam, the jobs they did and the changes in the soldiers themselves?

"Grunts Volcabulary Primer" which is the slang words used by the military in the war inorder to mask its actual meaning and also, inorder to prevent the enemy soldier from understanding what message is being passed across.

It is important in understanding the soldier's role in vietnam because, it afforded the vietnam soldiers to passes messages across to each other about the enemy soldiers. This led to the prolonging of the war in vietnam.