Flying saucers as Vrass:
Ss the Vrass, upgrade to flying saucers as soon as you can. They are amazing against enemies on the ground and in the air.
Locating enemy bases:
Launch a bomber or fighter. Run from your heli-pad and follow them back to their base when they fly back to reload.
Recommended formation:
When creating a huge attack group, position scout vehicles on point to attract enemy fire. Scouts are less expensive to replace if they are destroyed.