Marine

The United Nations Space Command Marine Corps is a branch of the UNSC Defense Force 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's most notable conflicts was fighting a losing war against the Covenant's highly superior technology and numbers.

Picture
http://images4.wikia.nocookie.net/halo/images/thumb/c/c3/Halo_3_Marine.jpg/120px-Halo_3_Marine.jpg