The UNSC's Field Armory is a cross between a machine\fabrication shop, and a research laboratory. This is where the most advanced technology for the UNSC is created by dedicated engineers and scientists. An excellent tactic to use with the Field Armory is to build one early on, quickly research any upgrades the player plans to utilize, and then scrap the building in place of a Vehicle Depot, Air Pad, or Barracks, allowing for the highest possible number of Supply Pads, while still leaving room for unit production. It costs 150 resources and requires a tech level of 1.