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.