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The National Space Policy of the United States of America (2010) calls on the National Security Space (NSS) community to continue to "develop and apply advanced technologies and capabilities that respond to changes to the threat environment." This national policy reinforces a trend within the NSS community that places a greater emphasis on the ability of NSS systems to operate in an uncertain future. This dissertation informs policymaking by presenting three essays that address some of the challenges associated with improving the flexibility of NSS capabilities. In addition, each essay includes an application of the decision logic that would be required to optimally support the next generation of flexible space systems.