This is the Garage. In the Garage (Insert Faction Name), you'll find the mechs that your faction can pilot and use. The Garage also diagrams the stats for the mechs which include:

Mech Details

+ HP
+ EN [Ammo is a Weapon Stat]
+ Moblity
+ Melee Attack
+ Range Attack

There are different mechs for different tiers except for 3rd tier. Also in the Garage, you may view the different items your Faction has ownership over. There is no need to post anything in the Garage.