Hugh - the anti -colls don't get turned off on a mil helo and the issue was with the helideck crew totally ignoring the aircrewman and doing their own thing, including getting too close to the tail rotor - the incidents were passed back up the chain and some re-briefing took place by the company involved.
Since then - no problem but, as you know, familiarity can breed contempt and slack practices can gradually erode safety margins until a near miss (hopefully nothing worse) re-aligns those safety margins.