Halo: Reach now uses a credit (cR) system that allows players to increase rank. For every cR earned, the player moves closer to a higher rank. Credits can be earned from Campain, Multiplayer and FireFight. Credits are earned through basic gameplay, medals earned, commendations and slot machine (given a the end of any matchmaking game). Credits are also used towards the purchase of armor upgrades. While you may spend cR on armor, your advancement towards your next rank does not diminish beacuse of spending cR. Once a cR is earned, it is applied towards rank and does not reduce (unless you get the ban hammer for cR boosting). Below is the list of available ranks and the required number of cR to reach each:

Follow up:

	Recruit	0 cR
	Private	7,500 cR
	Corporal	10,000 cR
	Corporal Grade 1	15,000 cR
	Sergeant	20,000 cR
	Sergeant Grade 1	26,000 cR
	Sergeant Grade 2	32,500 cR
	Warrant Officer	45,000 cR
	Warrant Officer Grade 1	78,000 cR
	Warrant Officer Grade 2	111,000 cR
	Warrant Officer Grade 3	144,000 cR
	Captain	210,000 cR
	Captain Grade 1	233,000 cR
	Captain Grade 2	256,000 cR
	Captain Grade 3	279,000 cR
	Major	325,000 cR
	Major Grade 1	350,000 cR
	Major Grade 2	375,000 cR
	Major Grade 3	400,000 cR
	LT. Colonel	450,000 cR
	Lt. Colonel Grade 1	480,000 cR
	Lt. Colonel Grade 2	510,000 cR
	Lt. Colonel Grade 3	540,000 cR
	Commander	600,000 cR
	Commander Grade 1	650,000 cR
	Commander Grade 2	700,000 cR
	Commander Grade 3	750,000 cR
	Colonel	850,000 cR
	Colonel Grade 1	960,000 cR
	Colonel Grade 2	1,070,000 cR
	Colonel Grade 3	1,180,000 cR
	Brigadier	1,400,000 cR
	Brigadier Grade 1	1,520,000 cR
	Brigadier Grade 2	1,640,000 cR
	Brigadier Grade 3	1,760,000 cR
-	General	2,000,000 cR
	General Grade 1	2,200,000 cR
	General Grade 2	2,350,000 cR
	General Grade 3	2,500,000 cR
	General Grade 4	2,650,000 cR
	Field Marshall	3,000,000 cR
	Hero	3,700,000 cR
	Legend	4,600,000 cR
	Mythic	5,650,000 cR
	Noble	7,000,000 cR
	Eclipse	8,500,000 cR
	Nova	11,000,000 cR
	Forerunner	13,000,000 cR
	Reclaimer	16,500,000 cR
	Inheritor	20,000,000 cR