Department of Defense Directive 3100.10: Space Policy, October 18, 2012 [Incorporating Change 1, November 4, 2016] [open pdf - 129KB]
"This Directive reissues DoD Directive (DoDD) 3100.10 (Reference (a)) to update established DoD space policy and assigned DoD responsibilities for space-related activities in accordance with the National Space Policy, Presidential Policy Directive-4 (Reference (b)), and the National Security Space Strategy (Reference (c)). It addresses the need to deter aggression, promote stability and responsible use of space, integrate space capabilities, and improve space mission assurance."
Department of Defense Directive 3100.10; DoDD 3100.10
Defense Technical Information Center: http://www.dtic.mil/