I don't know if it's possible to extract from MCC files, but you can just extract them from the original X360 version of the game, since they're technically the same.
You can use
Adjutant for this:
http://forum.halomaps.org/index.cfm%3Fpage=topic&topicID=45590 And also you'll need the
Reach map files, which you can find here:
https://haloce3.com/xmf/Make sure you download the "shared" maps (mainmenu.map, shared.map, campaign.map), those are obligatory. Then you can just download the multiplayer/singeplayer map you want, there's no necessity to download all of them.
To find the model, you can type in Adjutant's search bar for "marine". Then, clic on the "render_model" section and you'll find the Marine model with its permutations (Adjutant also includes a "model visor" mode).