Department of Defense Manual 5105.21, Volume 1: Sensitive Compartmented Information (SCI) Administrative Security Manual: Administration of Information and Information Systems Security [October 19, 2012] [open pdf - 424KB]
"This Manual is composed of several volumes, each containing its own purpose, and reissues DoD [Department of Defense] Manual 5105.21-M-1 (Reference (a)). The purpose of the overall Manual, in accordance with the authority in DoD Directive (DoDD) 5143.01 (Reference (b)), is to implement policy established in DoD Instruction (DoDI) 5200.01 (Reference(c)), and Director of Central Intelligence Directive (DCID) 6/1 (Reference (d)) for the execution and administration of the DoD Sensitive Compartmented Information (SCI) program. It assigns responsibilities and prescribes procedures for the implementation of Director of Central Intelligence and Director of National Intelligence (DNI) policies for SCI."
Department of Defense Manual No. 5105.21, Volume 1
Defense Technical Information Center (DTIC): http://www.dtic.mil/