Ten minutes after an Office is captured, the town's Army Bunkers, Airfield Bunkers, Docks and Factories become capturable. The attacking side must continuously hold one flag in the town for this to happen. It does not have to be the same flag, they may capture two, lose one, capture another, lose the first, in any combination as long as they continue to hold at least one flag for ten minutes. Once all the town's Office buildings, Army Bunkers, Airfield Bunkers, Docks and Factories are captured, the AO and DO are lifted and the town changes ownership to the attacking side. All towns have an Army Base, some on rivers have Docks, some with large historical airfields have Airfields with a command bunker, and some important industrial towns have Factories.