If,by chance,the "USN" in your screen name means Navy then you've got this old Army guy beat when it comes to discussions of bodies of water.But the report I saw indicated that they had the belts that go over *both* shoulders rather than one.That's why I used "fighter pilot type".
Like I said,if you're Navy...or former Navy...I'll defer to your judgement here.
I have flown in several models of AS350s and never saw the H harness for pax in the back, but they could have a special configuration.