Extract the model with Entity if your doing it with Halo 2.
Go to Entity open the modl tag and find the MC hit the blue plus sign in the top and hit extract to .obj then go to 3dsmax, and go to file<import< then find the MC that you extracted.
yeah i got version 5.0 and there is no obj plugin
EDIT: ok i found plugins but the mc is way to tiny to see even if i zoom all the way o and can someone tell me how to turn a differnt direction or turn the camra