UNSC rank structure/Spartan

All table information sourced from Halo: Official Spartan Field Manual pages 32-33 and Halo Encyclopedia (2022 edition) page 65, except where otherwise noted.

Role	Spartan	Fireteam Leader	Mission Handler	Spartan Commander	Director of Spartan Operations
Responsibilities	Augmented special forces equipped with MJOLNIR Powered Assault Armor.	Field leader of a fireteam of 4-5 Spartans.	Spartan Command liaison and intelligence support stationed at headquarters. Responsible for managing 5-10 fireteams, or 20-50 Spartans.	Overall command-and-control of Spartan Company. Responsible for upwards of 300 Spartans.	Commander-in-Chief of the Spartans (CINCSPAR)
UNSC authority	First Lieutenant	Captain	Major	Colonel	General