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