Knew several folks who managed to fall off the top of a Chinook - a broken wrist for one guy, neck for another (got to wear that lovely halo bolted to his head for months), another lost a testicle (landed just right (or wrong depending on how you look at it) on the edge of a work platform!).
Always hated deicing them in the winter out on the flight line - brooms & pump-up sprayers with deicing fluid were the norm. Nothing beats climbing up on top of a metal fuselage covered in snow & ice
