The 21th Battalion:

I can see a slight similarity, but when was this picture first shown? Was Halo Wars even out then?

"The 21th Battalion" 

No. This pic has been out for about a year. 

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[IMG]http://i111.photobucket.com/albums/n130/RyanJohn87/hwb2.gif[/IMG]
We'll give them war.

Wow I've never noticed that before sure does look like a spartan to me, btw the fourth pick isn't WW2 thats Vietnam