Cheat: Invincibility
Like the GameCube and PS2 versions of MOH, the Xbox has key tap codes that activates cheat modes. All are entered when the game is paused. If entered correctly, the last key tap of the cheat causes the game to unpause.
Invincibility - Pause and press X, L, B, R, BACK, Y, X
Cheat List
Enigma Machine (the thing that looks like a typewriter) cheats. Green lights confirm correct entry.