Command Center

This is your main building, increasing it's level will help you unlock other buildings, and add the most power to your overall level. In times of attack, your command center will defend your base and according to it's level will determine it's durability and it's firepower.

The other thing you can get as you increase the level of your command center is more airdrops. Airdrops are basically free rewards sent to you which you can collect for free on the map. As you increase your command center level you will reach certain milestones that will entitle to you claiming more daily free airdrops.

You will also find the garrison button when you tap the command center. This will recall your units that are on the map and put them back in their barracks to protect them from enemies on the map and help defend your base.

There is also the relocate button. This will pack up your entire base and you can transport it somewhere else on the map.