Cheat mode
First select the units. Then, click the woman's head on the left followed the woman's head on the right at the command menu bar at the bottom right of the screen. Then click the eagle between the two women. The word "OK" will be spoken to verify entry. Then click the left eagle at the top bar with the date and time to activate God mode. Click the right eagle to go onto the next level. Select the "Armalite" on the command menu bar to reload your ammunition.

Just click on the eagle on top of the little level map on the command menu on the bottom of the screen to upgrade your troops' rank. The higher the rank they have, the stronger your troops.

Hints & Tips

Better reconnaissance
Make sure to camouflage the scout before exploring enemy areas. Then this unit will be just about invisible.

Grenades
Remember do not throw grenades upwards on a hill. They could roll back towards your units.

Mission bonuses
Finish the additional goals within a mission to find more supplies and reinforcements.

Building defenses
The engineer is the only unit that can build buildings and it should be used to build a defensive perimeter.

Changing range and firepower
Place your units in a civilian or military building. Then depending on the number of units in a building, their visual range and firepower can become greater.

Effective sniping
It is better to team a scout with a sniper. The scout can see farther, providing more targets for the range of the sniper's rifle.