Cheat Codes:
Type "money" on the "inventory" screen to get $5,000. This can be used many times.
Type in "moon" when you´re in "third-person" to get the "HUD" card. A nice ting to have when you need to avoid "infantry rockets".
Type in "design" during "placement stage", before the mission starts. Here you can modify your groups and more. Almost forward, use the left mouse key to bring up the "options" windows. This can give you an incredible advantage over your enemy!