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