The Global Defense Initiative (or GDI for short), in its own era, was meant to wage war against Tiberium and the Brotherhood of Nod. In a universe without Tiberium in mass quantities, it found a large part of its research useless. GDI faced war with Nod and the Covenant Loyalists, and did well in the beginning, as the Covenant Loyalist forces stood no chance against GDI's Zone Troopers. Lacking a true space force, however, proved to be their weakness, as GDI was hit with orbital bombardments from the more space-oriented Covenant. It soon had to rely on the UNSC or Hellcat Squadran for proper support.