HC players have abilities that are not available to the rest of the playerbase, namely in the placing of Attack Objectives (AOs). When an AO is placed on a town, the other side gets an automatic Defence Objective (DO) on that town allowing all players to know that it is under attack. 10 minutes after an AO is first placed on a town, the town's Depot Office building, City Office building, and Rail Road Office buildings all become capturable. These capturable buildings are collectively known as Capture Points (CPs). Entering the Flag building linked to an Office building (marked with a large flag) will show an attacker how long it will take for the building to become capturable.