Halo 3: ODST 2009 first-individual shooter sport developed by Bungie. Published by Microsoft Game Studios. The fifth installment within the Halo franchise as a aspect sport,[1] it was launched on the Xbox 360 in September 2009. Players assume the roles of United Nations Space Command Marines, generally known as "Orbital Drop Shock Troopers" or ODSTs, throughout and after the events of Halo 2.