Unlimited Turns
1: Get into the combat mode.
2: Take ammo for a gun and put it in to your hands (only ammo should be in your hand!)
3: Come close to a guy and click on target to shoot him!
4: HE will say something like “Did your mama teach you that move?” or something.
Raise your armour class
1: Put on armour
2: Go to inventory and drop armour (option+click and hold)
3: Exit invantory and pick up armour
4: Put armour on.
CONTROL-X
Press to be rearmed (weapons back at full).
Shift-T
Press to change the time of day.
Skill Levels
1: In the new game dialog type # followed by a letter representing the day (day 1 = A, day 2 = B, etc.).
2: Hold down Command-Option-shift-Capslock and hit the OK button.
Choose Plane
Hold down the option-key while selecting Tour Of Duty and a dialoge box where you can choose any plane you want will appear.
Immortal
First you fly out over the sea put it on full thrust and go as fast as you can. Come down quite low and then get an external view of the plane from the side. Come down as low as you can until you see your shadow. While still flying as low as you can without crashing and fast put down your landing gear and just drive along the water, you can pick up some amazing speeds and when fly back up into the air you can do a nose plant straight into the ground with out crashing or dying.
Skip Missions
Hold down the option key and click on briefing to go to the next mission. Do it as many times as you like.