"Operations center for the deployment of the army and defenses to attack the swarms of infected in the open field"
Outposts function as general's headquarters during Swarm campaign missions. When infected enter the map, they immediately move to attack it.
If player decides to take the Armored Attack Station technology during campaign, the outpost will be replaced by advanced outpost, which has 3000 shields instead of 1000. Additionally 200 extra Empire Points are provided for use.
Functionally the Advanced Outpost is identical to normal Outpost.