The Federation is under attack and doesn't seem to be holding its ground very well. It is up to you and your Mechwarrior to put an end to their advancing armies.
Defend the tower as aliens are in full force of attack. Upgradable. Destroy as many aliens as possible and earn more credits to purchase/upgrade equipments.
Shoot the targets that are moving around the assault courses. Make sure to hit enough targets and progress to the next level. Try to earn over 2000 points on a level to unlock bonus mod AK-47!