What is the highest rank in Halo?

Captain is the hardest rank to achieve until you reach Commander Grade 3. The ranks after Lt. Colonel Grade 3 were unlocked on November 2, 2010, after the Halo: Reach community completed 117 million daily and weekly challenges combined.

Is the master chief human?

6 Answers. Master Chief, Spartan 117, is human. His name is John (no last name is ever given). He was a citizen of the colonies that was kidnapped at age 6, and taken to train for the military (in secret).