Instructions
Select the "Account Management" option on the Sony PS3's menu, and press the "Triangle" button on the PS3 controller. Select "Sign Out" to sign out of the PlayStation Network.
Insert the "Call of Cuty: World at War" game disk, and select it from the PS3 menu under the "Game" tab.
Press the "X" button repeatedly until you are at the "Sign In" page. Repeat this process until you see the error code "33" come on the screen.
Press the "X" button to sign into the "Call of Duty: World at War" servers, and the ranking will be bypassed. You will immediately be taken to boot camp.