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