More Upside Down Talk!
Hello again Swedish PRuNe!
Technically the AS350 in the photo I posted is a military helicopter, but I suppose you were referring to combat helicopters.
Actually there are a number of civil types that have gone inverted including the Hughes 500, Enstrom and ... so I'm told, someone in the Army here barrel rolled at CH53 Super Stalltion!
The image you posted is none other than the American legend Chuck Aaron, a 60 year old helo jock with around 20,000 hrs under his belt and runs the display circuit here in the US.