A drone command center at the Horsham Air Guard Station debuted recently, making it one of only a dozen such centers in the country, writes Alison Burdo of the Philadelphia Business Journal.

The use of the unmanned aircrafts – referred to as combat air control missions – began Sunday, according to the Bucks County Courier Times.

Using drones in warfare is a contentious issue.

The Courier Times reported that demonstrators regularly gather outside the Horsham Air Guard Station to protest.

Locals first learned the center would be at the Air Guard Station in 2013 when government officials announced the addition to the base.

A group of six control the MQ-9 Reapers, a multimillion-dollar drone most commonly used by the military, in the control center.

Military officials have previously said several hundred more fighter jet and drone pilots are needed, a demand that is expected to continue to rise as drones become a larger part of the country’s military tactics.

Click here to read more about the drone command center.