No they do because the spartans are just walking shields they can't take even a touch to the face after their shields go out. Spartans are way to weak health wise. Plus I am not suggesting a huge boost in health just one that is about the same as a marine squad.

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You can't play halo wars until you see this video
http://www.escapistmagazine.com/videos/view/zero-punctuation/645-Halo-Wars
I've been perma-banned at bungie.net :(