This is a VERY short mission. You must defend the Icarus. "This is great, it's just like a game" says briefing-boy. He's scolded, "Piloting a mech is not a game." He he he.
Note that one of the mechs here is your FRIEND - you can't shoot him, he's on your side. Really, just roam around the map shooting tons of enemies. You should get through them in a few minutes.
