The 2005 Defense Base Closure and Realignment Report Recommendation #146 called for the creation of 12 joint bases by September 15, 2011. The Department of Defense (DoD) executed the recommendation in accordance with the Joint Basing Implementation Guidance signed by the Deputy Secretary of Defense on January 22, 2008. This paper examines how this guidance shaped the formation and operation of the joint bases today. This research project also examines what effectiveness and efficiencies were expected and realized, and a root cause analysis of why they were or where not achieved. Finally, the implications on and strategic options for the future of Joint Basing in the Department of Defense are considered.