ODST

The Orbital Drop Shock Troopers (ODST) are an elite group of UNSC Marines that specialize in special warfare tactics. The ODSTs are one of the primary Special Operations units of the United Nations Space Command, and is under the command of UNSC Naval Special Warfare Command.

Pictures
http://images2.wikia.nocookie.net/halo/images/thumb/e/ee/1_318340723l.jpg/130px-1_318340723l.jpg