Horus Lupercal
Primarch - Warmaster
Professor
Swingin' on a Star
Deja Vu
Biker Mice from Mars
ET phone home
Floater
Copycat
Registered
All freedom fighters explode upon death
All freedom fighters' Toyota pickup trucks have been replaced by the Toyota Sprinter Trueno AE-86
All US Marine models changed to Arnold Schwarzenegger
Ayyyyaaayyyaaygghhh
US marines and British soldiers can no longer understand each other
AK47 shoots exploding bullets (not to be confused with the bolter)
RPG-7 is now full auto
M203 underslung g.launcher is now full auto
Precision bombers are now no longer precise, they could land anywhere, even on your head
Osama have been upgraded to OsamaTRON 9000, a weapon to surpass Metal Gear, also makes the final boss fight way more exciting.
All attack aircraft no longer bother confirming their targets before engaging, that means they'll shoot anything that moves on the FLIR.