Unless they are allowing multiplayer teams to choose more than just red/blue for colors, this picture then is from a co-op game. Now, if you look in the bottom right at the warthog, you will see a third spartan's visor sitting in the driver's seat. I think that Halo 2 will now allow more than 2 co-op players!
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It looks like the guy on the left is getting shot by bullets to me. and they all have blue striping on parts of their armor. also the filename is mp (multiplayer) 03