From threeA Wiki
The Earth Coalition, also known as the E.C. or as the Terran Forces, is one of the lead factions in the Great War. The Terrans follow the belief that their religion is the only correct one and that other belief systems should not exist.
Terrans exist primarily on Earth, but not exclusively, as Martian bots like Deimos Liberator give us reason to believe that the Terrans may have taken over Deimos. Terrans do not fully control the Earth either, as groups like Norge Defence and Aus Republic have given us reason to believe that there are Martian sympathizers inhabiting Earth nations.
Terran foot soldiers are known as Grunts.