ODST

ODST may refer to the following:
*Orbital Drop Shock Trooper - An elite group of UNSC Marines under the supervision of NAVSPECWAR.
*ODST Ballistic Battle Armor - The vacuum-sealed armor worn by the ODSTs.
*Halo 3: ODST - A video game by Bungie that serves as a prequel to Halo 3.
*ODST (achievement) - An achievement in Halo 4.