User blog comment:Kurt71sp2/clarifacation on my last article, why microsoft should redo halo combat evolved/@comment-1778984-20100121200243

They didn't leave that stuff out, kid. Alpha base, the raid, gamma station, etc didn't exist when the original was made, hence Halo CE being the original piece of Canon in the Haloverse. And, while I do see your point and I myself wouldn't mind a Graphics update to CE, adding all this would take from the basic storyline, so if they did add this, I would put these events into their own game that uses the same engine as Halo Reach