Seen it done over 20 years ago in Australian Chinooks , but at least the Australian military wear full harnesses not those useless lap belts around your guts the US military give there crews to wear !! ( you can't fall out of a six point harness no matter how stupid you are ).
and yes I may have done things like that when I was young and stupid! but I hope I killed off the stupid brain cells over the past 25 years.