Defense Technical Information Center Research & Engineering Gateway (DTIC R&E)
Both publicly available and access controlled documents in all areas of defense research (science, technology, engineering, social science, business & budget), DOD directives & instructions. DTIC is the central scientific, research, and engineering information support activity for the DOD.
Click the Access-Controlled Sites tab. Accounts available to DOD and federal government employees and their contractors. CAC login/registration required.