Joining a corps has several perks: 
 
- Corps Help. When you upgrade a building, research a technology or heal wounded soldiers, you can call for help in your corps and get time reduction when helped by other members.
 - Corps Store. You can buy some exclusive items here.
 - Reinforcements. When a daunting enemy attacks you, you can ask for allies' help. They can garrison their troops in your Command Center and defend it by your side against invasion.
 - Resource Assistance. You always need more resources in the game, and after joining a corps, you can ask for resource assistance from your allies.
 
        
      