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When playing the Vrass, upgrade to flying saucers as quickly as possible. These are very powerful units, devastating against enemies on the ground and in the air.
When launching a bomber or fighter, run from your heli-pad, keep in mind that enemy vehicles can target on your planes/saucers, and follow them back to their base very easily when they fly back to reload.
When creating a large attack group, put scout vehicles on point to attract enemy fire. The first few warning shots may take out a vehicle before you can respond, and scouts are cheap to replace.