I'm sorry if some one already said how to get the recon armor i don't have the time to read all the pages but i do know how to get it.  You get it by wining special competition.  My friend got recon by winning a valentime's day conpetition.  Just play halo 3 on special day's.  Some of the Bungie favorites also get recon.

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Only the great shall survive will you?