Socket Base

Socket Bases are base structures in Halo Wars and Halo Wars 2 that players are able to build and upgrade, depending on how much supplies and energy they have at their disposal. "Sockets" are referred to as "slots" in Halo Wars 2. The bases and their buildings are essential to produce troops, vehicles, and all sorts of upgrades in both campaign and multiplayer.

Halo Wars

 * Firebase
 * AirPad
 * Barracks
 * Field Armory
 * Reactor
 * Supply Pad
 * Vehicle Depot
 * Turret

Covenant

 * Citadel
 * Factory
 * Hall
 * Shield Generator
 * Summit
 * Temple
 * Warehouse
 * Turret

Banished

 * Stronghold
 * Apex
 * Foundry
 * Harvester
 * Power extractor
 * Raid camp
 * Turret
 * War council