This is for everyone who still thinks this is patched.

I know this has been posted before, but some people don't understand how to use the search bar.
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HOW TO HOST SEARCH AND DESTROY UNLIMITED LIVES
1. You Host a private match.
2. You invite friend to private match.
3. Set the game mode to Search and Destroy
4. Now click on switch lobbies, and hover/highlight over Combat Training.
5. Next you must press A,B,Up,A really fast, it should kick you out of Combat Training.
-Now your friend has been kicked into regular Search and Destroy in Combat Training. (Tell him to not touch anything once done)
6. Now go to private match.
7. Change game mode to search and destroy.
8. Click edit game options and click general options.
9. You will see Lives and Health options, click it and keep that screen up.
10. Tell friend to invite you to his game.
11. Tell friend to back out once you're in his game.
12. Change the Lives to unlimited and start the game.
You can invite all of your friends at this time too.
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HOW TO HOST ANY GAMEMODE ON COMBAT TRAINING

1. You Host a private match.
2. You invite friend to private match.
3. Set the game mode to (the gamemode you want to play)
4. Now click on switch lobbies, and hover/highlight over Combat Training.
5. Next you must press A,B,Up,A really fast and your friend should be in that gamemode.
6. Tell him to invite you and now you can play that gamemode.