You equip your doofuses as you place them in the starting positions. The weapon rack shows the exact number of gear you have left, and the stuff you take is reflected on the model. You want the right gun for the right range - the shotgun is, obviously, best at short range, while the assault rifle is good at long, yet takes time to aim. Giving you strict limits on the available armaments means you have to get a bit crafty.
Personally, I like placing rifle dudes some distance away from the door looking in to benefit from the range.
