The war is not done there, as they thought they've defeated the GLA once and for all. Oh, they were wrong. Now, the GLA are rising for the second fight and this time; they are much more prepared.
A combination between AP defense system and a barracks, allows it to defend itself from infantry and light vehicles.
Public Source if you want to use it in your mod: Moddb.com
Not sure about function, but it's totally a nice visual addition to good 'ol barracks