If you can ever locate a copy, see 'The Odd Angry Shot'. All about the Australian SAS in Vietnam. Nicely understated, well acted, well drawn characters and mostly good drills (except for some over-exhuberant activity on the range). A lot of very funny scenes but no punches pulled when it comes to the reality of handling wounded. It didn't make the big time because the septics only have a minor part in the plot.