In order to meet its mission, the Missile Defense Agency (MDA) is developing a highly complex system of systems ¿ land-, sea-, and space-based sensors, interceptors, and battle management. Since its initiation in 2002, MDA has been given a significant amount of flexibility in executing the development and fielding of the ballistic missile defense system. This testimony focuses on an annual review of MDA and on progress made to improve transparency and accountability. This statement is based on a March 2011 report. This is a print on demand edition of an important, hard-to-find publication.