What You Will Need:
xBox 360 Console
Copy Of MW2
xBox LIVE Account
Gamesave Of MW2 Spec Ops
USB(Flash Drive/Memory Stick)
Modio*
USB Xplorer*
A Brain

*Download Programs:

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Directions:
On 360:
1. Guide Button>System Settings>Memory
2. Hard Drive>Gamer Profiles>[Your Profile]>Move>USB Device
3. Hard Drive>Games>MW2>MW2 Save Game>Make Sure Its YOUR Gamertag Under The File Size>Move>USB Device
On Computer:
4. Plug In USB
5. USB Xplorer>File>Open Device>Click Until You See 41560817>Click It>Click All The Way Till The End>
6. Highlight savegame.png>Extract To ________
7. Modio>Game Mod Tools>Click MW2
8. Open>savegame.png>Select Desired Mods>Save
9. USB Xplorer>Inject File>savegame.png>Delete Old savegame.png
On 360:
10. Plug In USB
11. Guide Button>System Settings>Memory>Hard Drive>Gamer Profiles>[Your Profile]>Move>Hard Drive
12. Games>MW2>MW2 Save Game>Move>Hard Drive
Note: You HAVE TO Do The Following Before Anything Else! 13. Load MW2>Campaign>Resume Game>Save & Quit
14. Now You Can Do Spec Ops
15. Enjoy Your Modded Spec Ops Game

Please thank the topic and +rep if it helped.