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They should start you off with a plain Margherita PIzza camo, no toppings. Then, for every Ruthless medal you get while using it, you get a topping. Have to work hard for that Deluxe Ham, Pineapple and Bacon stuffed crust camo.
Or a "Kill Confirmed Camo", whereby you start a game of KC with a plain gun, and get to attach all the dog tags you pick up during the game, until your running around with a big jangly Mr.T wannabe gun.