Oooh! I once read a book on an Australian Battalion sent to Vietnam. They were badass. I have very little memory of it. It was a very long time ago--35 - 40 years. I recall they had a high elan, similar to USMC units, 101st ABN, LRRPs or 173rd ABN. I do remember a description of a ROK (Republic of Korea) unit operating in South Vietnam. If a soldier fell asleep on guard duty, the sergeant of the guard was expected to execute the offending soldier on the spot. ROK soldiers were/are Rock hard!. When I was a Battalion staff officer, we had this young 2LT of Korean descent from California. His grandfather had served in an airborne unit in Vietnam with the ROK army. The 2LT told us, his grandfather had to complete 100 jumps in order to earn his parachutist badge in the ROK Army. He laughed at American paratroopers who only needed 5 jumps.