Secret Weapons Over Normandy - Platform: Playstation 1

Cheats:
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From the starting menu where "New Game" or "Continue" 
can be selected (AKA main title screen):

Infinite Ammo:
U,R,D,L,U,R,D,L,L1,R1 

Invulnerability:
U,D,L,R,L,L,R,R,L1,L1,R1,R1,L2,R2 

TIE: 
Finish all 15 missions of main campaign and all 21 challenge missions. 

X-Wing: 
Finish all 15 missions of main campaign and all 21 challenge missions 

DORNIER DO-335 ARROW: 
Beat all challenges and missions with all bonus and secondary objectives