Medal of Honor: Vanguard PS2 Cheats

Extra Armor:

pause the game and then enter up, down, up, down on the D-Pad. After that, press right, left, right, down, up, and right. Your character will be given extra armor.



Invisibility:

Pause the game and then enter up, down, up, down on the D-Pad. After that, press up, right, left, down, down, and up. Your character will be invincible.



Scope upgrade:

In the first level of the Market Garden campaign, if you can parachute into the windmill, you'll not only have a nice vantage point, but you'll find a scope upgrade for the M1 Garand.
Thompson drum upgrade:

 In the first level, parachute onto the red flare near the searchlight on the left of the screen.  Wax the solider there and pick up a 50 round drum for the Thompson. 






 Thanks to Revolution Reader Choorbs, drwfan19!