mark willacy: they're australia's elite special forces, the lethal operatives of the special air service regimentor more than a decade they were on the frontlines of australia's longest war. braden: you try to look back at your career as try and be proud of it, but then you've got all these incidents. you see yourself as part of the bad guys. mark: tonight, the deadly operations in afghanistan with australia's secretive sas. [speaking foreign language] for f-- sake. yeah, yeah, get the f-- here. mark: revealed in never-before-seen footage obtained by four corners. for the first time a special forces operative who was on these covert missions speaks out about what he saw. braden: the guy had his hands up, and then it was almost like target practice for that soldier. he shot him, you know, twice through the chest, and then once through the head as he walked past him. mark: for years, the secrets about what exactly happened in the valleys, fields, and mud villages of afghanistan have remained hidden. with a major inquiry about to report on suspected war crimes, four corners will tonight reveal the c