Just type these codes during gameplay:

 AirNormandy      Soldiers re-jump into normandy
 AngryManDinners  Soldiers are given food
 Iknow  displays  All germans, equipment bags, and insides of buildings
 TraitorTraitor   Current soldier surrenders
 PrisonPod        Removes all parachutes
 Weasel           All soldiers on the map are made available
 YouGoSquishNow   All the germans on the map are killed
 Helllive         All the germans on the map are killed
 Ihaveyounow      All the germans on the map are surrendered
 Beef             All the cows on the map are killed
 Heknows          Turns off Iknow
 Robocop3         Makes your soldier go berzek
 Hohoho           Gives your GI a brand new MG42 plus two ammo belts