This report defines a set of strategy options, each with associated capabilities, gleaned from other leading think tank reports as well as the study team's analysis. The report identifies capability priorities for the 2021 and beyond security environment and recommends a force structure for a 2021 affordable military.

This report focuses on the ways that a federated defense approach can strengthen strategic partnerships and deliver more innovative defense technologies at a lower cost by better harnessing global supply chain networks to expand the military supplier base and increase the net capability available to the network of partners and allies."

This study identifies five alternative strategies and, using CSIS's Force Cost Calculator, builds a cost-capped force structure, modernization program, and readiness profile for each strategy. It then stress-tests each strategy against four sets of simultaneous conflict scenarios, which the authors devised. The study explores potential ways to mitigate the fiscal pressure forcing these strategic tradeoffs. It concludes by making recommendations for the FY 2017 defense budget and the next Quadrennial Defense Review (QDR).