Improving the U.S. Department of Defense (DoD) acquisition system-the management and development processes by which the department acquires, develops, and sustains weapon systems, automated information systems, and services-has been an issue of sustained interest to policymakers since the beginning of the military establishment. Numerous actions have been initiated and implemented over decades to rein in the increasing life-cycle costs and to ensure a timely delivery of these systems to meet U.S. security needs. In 1986, a confluence of trends external and internal to the department prompted Michael Rich, Edmund Dews, and C. L. Batten, Jr., to write Improving the Military Acquisition Process: Lessons from Rand Research. In that report, the authors identified major trends expected to affect the acquisition of defense systems for DoD and drew on RAND Corporation research to develop a strategy for meeting the challenges imposed by these trends. Like that earlier work, this report is informed by opensource documents and draws on insights from publicly available RAND research to suggest potential improvements that might help address challenges in the defense acquisition process. The issues that we highlight are also informed by other organizations examining defense acquisition issues.We expect this document to be of interest to DoD policymakers, congressional lawmakers and their staffs, and anyone interested in the acquisition of defense systems.