This is created after this: [MW3] Killstreak Hack/Tool [1.1.0]
So some of the credit go to @insane18 even he had nothing to do with this really. Just did so I added the Image Preview.
Well, simple to use:
1: Start MW3 and the Hack/Tool. 2: Select the class you want to change the Killstreak for. 3: In-game open your class and set the Strike Package to SUPPORT. 4: Go back to the Hack/Tool. 5: In the Killstreak 1-3 you will choose what killstreak that will be used. 6: Press Save when you have chosen witch Assault Killstreaks you want to use. 7: Close the program and enjoy your game.