"The Garrison can house many troops and vehicles, and will send those units out to fight off any enemies who venture into its wide defensive radius. The Garrison is so manly that it even makes its friends and family members call it MISTER Garrison."
The Garrison is a defensive structure that functions like a Bunker or Guard Post, however, can house more Units, up to 30 at any time. The Garrison also covers a greater radius compared to Bunkers or Guard Posts, covering a total of 20 spaces on a player's Outpost.
The build costs are quite high: 5,600, 7,000, and 100,000.