User blog comment:BronxZilla/Green Berets vs UNSC Marines/@comment-4484220-20120721213723/@comment-4484220-20120722011021

The only time in Halo games that I saw absolutely anyone trying to fight the Covenant was at the beginnin of Halo 1 when everyone, including non-combat personell, are evacuated from the Pillar of Autumn and have to fight to survive. As for only Master Chief and the Arbiter being the only ones standing in the end, that's only if you Play the game on Heroic or Legendary. If you play the game on normal (and I'm pretty sure that normal indicates that that's how the events regularly play out, and that heroic and legendary are just to make the game more challenging), then your marines are able to hold up quite well, and sometimes are able to secure the entire area without you intervening.