In accordance with the National Defense Authorization Act for FY 2004, the Defense Science Board (DSB) was asked to assess the potential contributions of a Space Based Radar (SBR) to missile defense. In response, the Undersecretary of Defense for Acquisition, Technology and Logistics (USD (AT & L), and the Director, Missile Defense Agency (MDA) directed that the DSB Task Force on the Contribution of a Space Based Radar to Missile Defense perform the following tasks: Assess the impact of adding a missile defense mission on the ability of SBR satellites to conduct their primary missions; Assess how different SBR architectures and technical approaches might affect the ability of the satellites to achieve their primary missions and to contribute to missile defense; Assess the value of potential SBR capabilities in the context of the family of sensors being developed by the Missile Defense Agency; and Recommend any future actions that might be desirable related to SBR contributions to missile defense.