[@ClocktowerEchos] Fair enough. The correct answer is: If we are on an outer-colony, doing nothing. Ork Freeboota's are mostly left alone whilst planetside. This is because they are nomads that look for fights. Local PDF's don't have the manpower or experience to properly take on an Ork Krew and engaging them only provokes them to stay and fight.

General procedure is to let them go about their business unhindered, then call the Imperial Navy to deal with them once they have left. Outlying governors opt for this, due to it being the cheapest way of dealing with them. an Ork Krew that has set up camp on your world is extremely expensive to get rid of.