Go to private match, make a match, S+D, Unlimited time, minuscule health, unlimited lives, 30,000 score, Custom kill streaks.
3 kill streak - Gunship
4 kill streak - Dogs
5 kill streak - Rolling Thunder
Save to your file - > Go to player card - > Go to File Share - > Remove the file.
Go back to Edit Game Settings or whatever it's called where you make your match, save it again.
Now switch lobbies to combat training, switch lobbies back to private match and then switch it back to combat training, just make sure its hovered over combat training. Now you should be in combat training, go to player card - > File share - > Click the file but don't click load. When you're ready click X (or O on a Japanese Ps3) like 4 times or 5 times. Then you should be in Combat training then it'll say team deathmatch at the bottom of the picture of the map, then it should load up S+D.
Once done that, invite 8 of your friends. Start the game. Get your friends to switch team. And tell them not to kill you. Then it's 1 - 17.
Easy as piss.