Activate the cheats by pressing [Enter] during a mission, then typing in the
code.

winmission - Win current mission
hittingandhealing - Press CTRL + LMB damages clicked object
- Press SHIFT + LMB heals clicked object
speedhack - Keys T & Z affect game speed
immortalone - God mode
endlessmunition - Infinite ammo

These codes are done inside the bunker:

showtrader - Seeker has everything
allvehicles - One of each vehicle
soldierspawn - Spawn a new soldier, but not sure exactly how this works