If you manage to get to the left side Anti-Air Turret (assuming you are charging into the Command CP for the Rebels/Republic) as the Empire/CIS (may only work with Imperial Dark Trooper), you can get into a position where, with luck, the enemy gunner will push you through the ground. From there you can kill enemies both inside the command post room and on the platform outside of it. If you run out of ammo, you can walk through the wall towards the CP and you should end up under the ramp leading to the previously mentioned turret. The ammo droid in the room can reach you from here and you can get ammo.