First enter through the ventilation tower with your Q-claw then jump
down onto the floor but stay behind the guy typing on the computer then
get out your fist and punch him from behind then you will see a red key
card on the desk pick it up decrypt the door in front of the computer
walk over to the amory door and there will be a slot to stick the
keycard into then the door will open and a rocket launcher and 4 grenades
will be in there. ENJOY!!!!!!!