The Defense Technical Information Center (DTIC) indexes and abstracts defense-related government-sponsored scientific and technical reports. Most reports published since the late '90's are available as pdf files.
The link below provides access to their public search as well as to the R&E Gateway, which has an enhanced interface and provides access to additional documents not available on the public site. We encourage our U.S. students, faculty and staff to register for the R&E Gateway. Click on Login/Register or Search DoD Technical Reports to register.
The Government Accountability Office (GAO) produces an annual report "Defense Acquisitions: Assessments of Selected Weapon Programs." Links to the pdf files for the most recent years are below.
DoD produced these reports on the performance of the defense acquisition system annually, 2013-2016.