There is a 40ish year period of the spartan-IIs life that has not been touched by a game. They really should do something with that.
Hell, in half the reviews for reach I read they thought Halo: Reach was the first time we fought the covenant. SO many people are oblivious to the 25 year long war.
[Edited on 11.20.2010 1:20 PM PST]