Human

The Human Race is an early-Development Space Faring Civilization whose home world is Earth, located in the Sol System. In 2525 they met the Covenant, a deeply religious, xenophobic collection of alien races. They have been at war ever since, using their collective knowledge along with their main military force, the UNSC

By the time of the events of Halo, there are approximately 60,000,000,000 humans populating the galaxy, although numbers may be greater or smaller.