Earlier speculation on the relevance and references contained in the word 'Halo', seem to keep clear of the obvious religious connotations of the word.
Angels wear 'em.
While organized religion does trigger a nervous tic in my lower left eye lid, it seems as though there are some heavy religious thematics in the available body of Halo-nalia. The quotes taken from the dialogue that is the topic of Mark Levin's theory contain language which evokes both passages in the bible and various poetic works of William Blake. The following quotes and the analysis of them are presented here for anyone who hasn't seen this discussion at Marathon Story. And I saw an angel descending from the heaven, having the key of the Abyss, and a great chain in his hand. The speaker of the Bungie line would seem to be the entombing angel, having governed the unwilling Deciver Satan.