"A new recruit! Excellent. When you are ready to fight. Enter center of the red Crimson Lance logo notify the squad you are ready.[sic] This first round weeds out the real weaklings. Let's see how you do."
Survive the round.
It is possible to solo this easily with no problem. Make sure you are stocked up on ammo and med packs. To start the fight, you need to enter the red circle that you will see on top of a podium. That will begin the match. Slowly, as you kill the Lance one by one, they become more lethal, by going from normal Lance, to chemical Lance to defenders. The match should take between 5-7 minutes if soloed. In a group, it should take around 3-4 minutes.
"Not bad. A bit of a greenhorn, but you show potential."