[quote=@fallenstrife6]
Question, since it isn't in anyone's CS or anything. What are our military ranks? 
[/quote]

So doing my own little research on the forums, Spartan IV's as far as we know don't have a formal ranking system. Since they are taken from various branches of the UNSC military, Army, Marines, Navy, ONI, Airforce ect. Instead they have more of a hierarchy system, you have your Fireteam Leaders, Team Handlers and then the Spartan Commander leading all fireteams. Spartan II's would still retain their respective ranks. While Spartan III's if they were in either teams like Noble or in the Headhunters may have their ranks or not depending on how they merched with the Spartan Branch instead they are simply referred to as Spartan (insert name).

[url=https://www.halowaypoint.com/en-us/forums/db05ce78845f4120b062c50816008e5d/topics/spartan-ranks/2c765fd9-1017-4f95-b22a-9441d266de14/posts?page=1#post2]here is a forum post.[/url]