Command & Conquer: Red Alert 2 Tips

Spy Jobs
Spies are extremely useful for some missions (especially the one with the two nuclear silos!) and for skirmishes! Here are a list of what they can do:
Power Plant - shuts down the enemy's power
Ore Refinery - Steals half of the enemy's funds
Radar/Air Control - Resets enemy's radar
Barracks - Makes all fighting units veteran
War factory - Makes all tanks veteran
Battle lab - Gives you an extra unit to train