Invincibility:
     Pause the game and press X, Left Trigger, B, Right Trigger, Back,
Y, X.

Cheat codes:
     Enter these codes at the Enigma Machine.

Code:                   Result: 
ENCHILADA               Unlock Everything 
BASS                    Unlock Mission 2, A Storm in the Port 
STURGEON                Unlock Mission 3, Needle in a Haystack 
PIKE                    Unlock Mission 4, Several Bridges Too Far 
TROUT                   Unlock Mission 5, Rolling Thunder 
CATFISH                 Unlock Mission 6, The Horten's Nest 
SALMON                  Get a Gold Medal on the previous mission 
LONGVIEW                Snipe-O-Rama, all weapons are sniper mode 
KILLSHOT                Silver bullet, One hit kills enemies 
ONESHOTGUN              Perfectionist, One hit kills you 
CRANIUM                 Achilles' head, Enemies only dies of headshot 
FLUBBER                 Rubber grenades 
NOHITSFORU              Bullet shield 
GHOSTARMY               Invisible Enemies 
BOOTDAHEAD              Men With Hats 
TOPFUN                  MOHton Torpedo 
BACKSTAGEO              Making Of D-Day FMV  
BACKSTAGER              Making Of Needle In A Hay Stack FMV  
BACKSTAGEF              Making Of A Storm In The Port FMV  
BACKSTAGES              Making Of Several Bridges Too Far FMV  
BACKSTAGET              Making Of Rolling Thunder FMV  
BACKSTAGEI              Making Of The Horten's Nest FMV  
FLIPBOOK                Animation reel 
COTOBREATH              Paintball FMV 

Get the EA LA Medal of Valor:
     Finish with a Gold Star in every mission.

Understand the Germans:
     Turn  on  the subtutles in the Options menu to undertand what the
Germans are saying.