Go to your cheats page and put on All Guns, Infinite ammo and Invisibility (if you have it.) Then go to the second bunker (on missions) and then set off the alarm
and go to the room with TV's and put remote mines on every TV and blow them up! Now you can go around making everything float (Rockets, grenades, mines, tank shells, etc) This is a really good glitch if you love to kill guys!!!!!