This is a quick tutorial on how to Mod the ODST Campaign using a little tool called [ Register or Signin to view external links. ]
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Requirements -

USB Device
Liberty Modding Tool
ODST Game Save
5.3MB Available storage on PC
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1. Go to the mission you want to complete, save and quit right when the game starts and press guide on your controller, scroll right all the way, and go to System Settings and go there.

2. Make sure you USB Device is configured to your Xbox 360 and go to your HDD and move your ODST Campaign Saved game to your USB Device.

3. Move your USB Device to your PC and download Liberty and open it up, it should look like this :


4. Now click on the Second Option, which is open from your USB Device and now click next, then click next once more.

5. Where it says select your save, click Halo 3 ODST.. which should be on there.. I know, on the picture it is Halo 3, same thing. :]


6. Once your clicked your save (Halo 3 ODST) click next, and where it says "Is this Right?" make sure it is, then click next once more.

7. Now check Invincible health on the screen, click the little box.


8. On the next screen it says your weapon ammo and I suggest you click Max on all of them, the ammo might be 32k+ depending on your gun.


9. Then, you can max out on Grenades also, just once again click the Max button.


10. If you want you can click this last option, I always do it just to do it.. but you don't have to.


11. Now it should save, and you're done!


12. Now move your USB back onto your Xbox 360, and move your ODST gamesave back onto your HDD, and resume your Campaign game when on the ODST Main menu.

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This tool also supports : Halo 3, Halo: Reach, and Halo: Combat Evolved Anniversary and basically the same steps.