Item and function:

Bullets
For your gun

Bullet-proof vest       
Put on to look like an SS

Bratwurst
Either tastes good or AWFUL

Cannon Balls            
Too Heavy to lift

Grenades
Blow things up

Keys
Open doors

Leibframilch
Makes you go >HIC!<

Medals
Nothing

Plans for Operation Rheingold   
Higher promotion when you escape

Saurkraut 
Either tastes good or AWFUL

Schnapps
Makes you go >HIC!<

Uniforms
Put on to sneak past guards