Sorry Bro There Is No Knife In mw3.
You press triangle, and it will put your throwing knife away.
Yes MW3 has a PS3 version of the game
no
Nope.
No there is not
Play more and read the wiki on MW3
To kill a juggernaut on MW3 on PS3 you can either throw a grenade at it possibly a Bouncing Betty or a Semtex. Or you could take a grenade launcher a shoot at the juggernaut and blow it up. Last thing is shoot at the opening spot (head) on the juggernaut. Oh, and a Helicopter of some kind.
You simply press the lethal button to throw press again or double tap x(square on ps3) to blow it up.
CAMPAIGNYou use a throwing knife in the last level of campaign i think wen u gotta kill this guyMULTIPLAYER ( offline )In multiplayer OFFLINE you get to level 7 and you can add it as 1 of your grenades things but it will be the throwing knife but be careful where you throw it because you only get 1 but if u have scavenger on u can get dead peoples ones or u can just die and u will get resupplied with oneHOPE I HELPED :)
1. unlock it in create-a-class 2. Put it in your class 3. get into a match 4. press RB on a xbox controller(default controls) dunno on a ps3 5. go kill some people! BTW you need xbox live gold / PSN to do this and you need to be on multiplayer
With a Printer.
In MW3, it is unlocked at Level 80, and in BO; it is unlocked at Level 12 and costs 2000 COD Points