Was it this one? Go to http://oopslist.com/ and check out CH-46 overboard.wmv - couldn't give the link as-is, they don't allow hotlinking.There is a clip out there with a Navy Helicopter crashing. It's trying to land on the helo pad and it takes a dive; no pun intended. The ground crew is nearly shredded, they earned their danger pay that day.
The clip doesn't work so I can't say it is.Was it this one?