Requires the Comptroller General (GAO) to: (1) review Department of Defense (DOD) programs and organizations related to, and resourcing of, renewable energy research, development, and investment in pursuit of meeting mandated renewable energy goals for DOD facilities; (2) specify programs, costs, and estimated and expected savings; and (3) report to Congress with descriptions of current renewable energy initiatives and resulting savings, assessments of coordination and challenges, and recommendations regarding the need for a new DOD energy strategy.