Reddit user GenericDreadHead posted up some cool stats on what you need to do in Iron Banner to reach rank 5.
worth a read for those of us that don't have a bunch of time to play.
[url=http://www.reddit.com/r/DestinyTheGame/comments/2w6twn/sga_how_many_matches_to_rank_up_ib_a_detailed/]http://www.reddit.com/r/DestinyTheGame/comments/2w6twn/sga_how_many_matches_to_rank_up_ib_a_detailed/[/url]
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There wouldn't be much to help someone who already hit rank 5 yesterday, lol