Dropship/CAS guide
From Rouny's Marine Corps 14 Wiki
Attack from Above
As a Pilot your Job isn't to just move People and Equipment from one place to another. You are also responsible for CAS (Close Air Support). By loading a gun into one of the slots of your ship you can rain bullets (or whatever you loaded) onto your fellow marines the Xeno hordes.
How to call in a CAS strike
To make a CAS attack possible, a mark is required. This can be either done by throwing a Marking flare which you can get from equipment vendors in the armory or by using a Laser designator, available to most combat roles. A pilot can then select the mark and open fire on it. You will also need a JTAC (Joint Terminal Attack Controller) key which can buy for points to give the clear for the attack and to receive intel on the status of the Air support teams.