Humans are the sentient beings that are native to Earth and part of the primate family. Fossil records date the last surviving species, the humans, as having existed for 200,000 years before the common era. Humans have upgraded from the Stone Age -the Paleolithic Era- all the way to the Great War Era by creating tons of new technology.
The United Nations Space Command, mostly known as the UNSC is the military, exploratory, and scientific agency of the Unified Earth Government. The UN massively militarizing its other world colonies with propaganda and then defeated communist and fascist forces in the "Interplanetary War" which consisted of side-battles that took place on Mars, the Jovian Moons, and the South American rainforests. Although the Interplanetary War brought much suffering and death unto Earth and its colonies, it united humanity's militaries into a common, armed force by the end of the 22nd century.
“Spartans never die.” -Kurt-051's last words.Spartan is the term used to describe members of several supersoldier programs instituted by the UNSC at various times, named after the Ancient Greek warriors of Sparta. The Spartan Programs were UNSC projects designed to create generations of physically, genetically, technologically, and mentally superior supersoldier fighting force within the UNSC Military. The Spartan programmed was soon ended because only one Spartan remained, John-117.