Season 4 of Halo Infinite, entitled Infestation, is landing on June 20. Among the new features is a new, entirely free progression system called Career Ranks.
The Career Ranks system takes obvious inspiration from prior games in the series, such as Halo: Reach and the Master Chief Collection. Each rank has its own symbol and military-style designation–such as cadet, gunnery sergeant, and general. Every individual rank contains three grades. Additionally, you can progress through multiple tiers of ranks, from Bronze to Onyx. For example, while a Bronze Corporal and an Onyx Corporal both have the same designation, the Onyx-ranked player is in a much higher tier.
You rank up by playing Halo Infinite; every completed matchmade game adds progress to your rank. Additionally, you can earn ranks just by putting the time in, but if you perform better, you will rank up faster. There are no CSR barriers for any particular rank. It also will not incoporate your previous play history when the progression system launches.