hbarrel, Heavy Barrel (US)
hbarrelw, Heavy Barrel (World)
The object was to go through and kill anything that moves while picking up different weapons. Along the way you could pick up pieces of an awesome secret weapon. When all the pieces are collected your soldier will yell "HEAVYYYYYYY BARREL!" and will switch to a huge gun that fires enormous screen-clearing blasts.
(fuzzy search, these MAY match the game, or they may not)