Halo 3 - Ranking System

      You gain experience in only one way: win. Winning will net you +1 experience point per match. Losing a match will not cause you to gain or lose any points while leaving a match before it has concluded will cause you to lose 1 experience point.
      Gaining experience will allow you to increase in rank but is limited by another facet of the ranking system, skill level. Skill level is increased by winning ranked matches. Though there are several different factors which can effect ranking, they all boil down to a point mentioned earlier, you must win.

The Ranks:

Recruit 1 Exp
Apprentice 2 Exp	Apprentice Grade 2 3 Exp
Private 5 Exp	Private Grade 2 7 Exp
Corporal 10 Exp	Corporal Grade 2 15 Exp
Sergeant 20 Exp	Sergeant Grade 2 30 Exp	Sergeant Grade 3 40 Exp
Gunnery Sergeant 50 Exp	Gunnery Sergeant Grade 2 60 Exp	Gunnery Sergeant Grade 3 150 Exp	Gunnery Sergeant Grade 4 300 Exp
Lieutenant 70 Exp	Lieutenant Grade 2 85 Exp	Lieutenant Grade 3 200 Exp	Lieutenant Grade 4 First Lieutenant 400 Exp	Minimum Rank: 10
Captain 100 Exp	Captain Grade 2 150 Exp	Captain Grade 3 300 Exp	Captain Grade 4 Staff Captain 600 Exp	Minimum Rank: 20
Major 200 Exp	Major Grade 2 300 Exp	Major Grade 3 600 Exp	Major Grade 4 Field Major 1200 Exp	Minimum Rank: 30
Commander 300 Exp	Commander Grade 2 450 Exp	Commander Grade 3 900 Exp	Commander Grade 4 Strike Commander 1800 Exp	Minimum Rank: 35
Colonel 400 Exp	Colonel Grade 2 600 Exp	Colonel Grade 3 1200 Exp	Colonel Grade 4 Force Colonel 2400 Exp	Minimum Rank: 40
Brigadier 500 Exp	Brigadier Grade 2 1000 Exp	Brigadier Grade 3 2000 Exp	Brigadier Grade 4 Brigadier General 4000 Exp	Minimum Rank: 45
General 600 Exp	General Grade 2 1200 Exp	General Grade 3 2500 Exp	General Grade 4 5 Star General 5000 Exp	Minimum Rank: 50