Crow's Nest

Holdout is believed to be the second campaign mission of Halo 3.

It takes place in a UNSC Base.It possibly seen at end of brute vidoc,and maybe seen at 00:47 and 00:53 in new E3 trailer Upon completing it on the Normal, Heroic, or Legendary difficulties, the player will earn the "Holdout" achievement and 20 Gamerpoints.