Halo Reach questions

There are two questions I had about Halo Reach that I’ve been unable to figure out.

  1. I’ve heard that Commendations affect your Credit gain… How so?
  2. Is it possible, or will it ever be possible, to change my nameplate again?
  1. The more you get the less credits you get. E.g, get an Onyx on Matchmaking for headshots, get less cR for Headshots

  2. Nope.