Guys who never survive past the mission.... unless it is Chips Dubbo or Sgt Avery Johnson.


The UNSC Marine Corps is a branch of the UNSCDF that is responsible for land-based military operations, as well as the protection of Naval vessels and installations from attack.


A rugged and diverse assortment of well equipped and well trained
men and women, one of the Marine Corps' most notable conflicts was
fighting a losing war against the Covenant's highly superior technology and numbers.

Source:http://halo.wikia.com/wiki/UNSC_Marine_Corps