At the time of the Vietnam war there was no such thing.The Vietnamese conflict as it was referred to, was supposedly only a peacekeeping action.We sent Advisors as early as 1966[W>O>Payne winning a Victoria Cross]. Then Conscription started.If your birthdate came up off you went to training camp and then to Vietnam.This caused massive demos against "the war"[morotoriums] realising in a political backlash on Govt.Then at the next election,Gough Whitlams Labour perty gained power and home came the troops.AND to what BLOODY NOTHING.. No recognition,no medals,people would spit on you in the street and you weren't allowed to join the RSL.because after all,it was only a police action.. It took until 1988[20 bloody years] before the veterans were welcomed home.. These are just random thoughts you can put together as a complete answer.I can't do all your homework for you