Miltary Bases are located around the map (in Everon there are 6). At the start of the game these will be occupied by the OF and resources will be allocated to them on a regular basis to add/replace soldiers/assets or build upgrades.
You capture a base by approaching the flag there and holding the action button for 15 seconds on it. You must then win a QRF event and defend it from the reserve forces coming from all other bases.
When you own a base it gives you certain advantages: