Hmm, I haven't actually figured that out just yet...let me whip up something real quick.
The guys you'll fight in this battle are the following:
Ocelots: Fast moving enemies with swords for destroying things. They have pretty weak armor though, and aren't too hard to beat.
Mithrils: The guys you're engaging, these come equipped with standard issue lasers and heavier armor than the Ocelots, though not that much more.
Purifiers: Larger ranged units. They have really heavy armor, and are equipped with flamethrowers and a heavy machine gun. Luckily this force only has two.