First You have to unlock 'Cheat' option. Press [Insert] [Insert] [Delete] [Insert] [Delete] [Insert] [Delete] to unlock it at the pause menu. Then, enter one of the following codes to activate the corresponding cheat function.
godmode - God Mode
cheat_victory - Skip Mission
trigger_damage - Damage Increased
Blazing Angels: Squadrons of WWIIMore guides, cheats and FAQS