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Ranks

In Halo 3 there are two indicators of your skill and experience - Skill Level and Rank. Supposedly both are used for Matchmaking. You gain rank by collecting Rating Points. Officer ranks (Lieutenant and higher) can only be gained with certain Skill Levels. You're promoted through the ranks pretty fast in the start, but then it slows down and it takes quite some work to reach the higher ranks. And the very highest ranks will probably be reached only by a select few.

Rating Points - You gain and lose experience points according to a simple scheme:

Win a match: +1 EXP (More specifically, coming in the top half. So for a team game, just be on the winning team.)

MVP: +1EXP

Lose a match: 0 EXP

Quit a match: -1 EXP

There's no penalty for losing a match, although your level will decrease if you have a losing streak in ranked matches.

You dont get an EXP point for gaining MVP in any social game. But you do if your team wins, or you finish in the top half of Rumble Pit.

Also, Lone Wolves has only 5 players, the top three will gain EXP.