Materials:
-USB Flash Drive (Support up to 1GB)
-A Computer w/ Internet (Which you should have)
-Xbox 360
-A second USB Flash Drive or Memory Stick (Optional)

Modding a MW2 Campaign and Spec-Ops is very similar to Modding a Gamertag, in fact it uses the same programs but one.

First you need to download these programs:
Always need: WinRar 32-Bit
Modio
USB Xtaf

1. Install WinRar if you haven't already.

2. Download Modio and USB Xtaf.

3. Open and Run Modio first (Because it takes longer to load).

NOW! Put you USB Flash Drive in your Xbox 360 and Configure it. Then on your Hard drive, go to Games--> Modern Warfare 2--> the Saved Game
you would want to Modify, and Move it to your Flash Drive.

4. Insert your USB Flash Drive or Memory Stick with a USB Cord Intact.

5. Open and Run USB Xtaf Xplorer

6. Go to File--> Open Device( If your Flash Drive is the only detachable source on your computer ).



7. It should say ContentClick that.

8. (If your USB Flash Drive was formatted before all this, do this).
- Keep clicking the on your file until you find a file called savegame.svg

9. Now click Extract and to your Desktop.

10. Now go to the Modio Program. On the Top-Left Corner there is a Orange Document Holder Icon, click it.



11. Find your Gamesave on your desktop.

12. Now a Program on Modio will pop up like in the Picture except for Modern Warfare 2.

13. Click Mod File.

14. Well now choose what Mods you want (Dvar Lists are optional)

15. Now Save it. It should be Rehashed and Resigned.

16. Back to USB Xtaf. CLick Inject, and your new modified gamesave. Delete your old gamesave file (You will still have your progress on the new gamesave).

17. Disconnect your Flash Drive and into your Xbox.

18. In the Memory Section, click your FLash Drive--> Games--> MW2--> Saved Game

19. Now COPY it onto your Hard Drive

NOTE: If you would like to keep the same mods and not keep going back to your Computer doing this everytime, also copy the Modded Gamesave onto another source like a memory stick or another flash drive. For these Mods to keep working they must be Rehashed and Resigned every time you get off Campaign or spec-ops, having another source with a rehashed and resigned game save will come in handy.

20. Now Completely turn off your Xbox. Turn it back on.

NOTE: Keep your Flash Drive in your XBOX

21. Go to MW2, Sign in the PRofile you modded the gamesave for.

22. You must go to Campaign first.

23. Select Save Device: FLash Drive

24. Then you must go to Resume Mission

Now you should have all the mods you chose on. After Missions and Restarting Missions cause you to lose some Mods like Inf Ammo, Fast Sprint. You can Restart Checkpoint or Rehash and Resign your Gamesave again (Or Step 19 NOTE).

If you would like ALL of your Mods to start on a certain mission, select that mission, Save and Quit and Repeat Steps 3-24

It seems like a long process but no.
This Will NOT work for XBOX Live, thats what Jtags are for