DoD Instruction 8410.01

Citation
Department of Defense, DoD Instruction 8410.01: Internet Domain Name and Internet Protocol Address Space Use and Approval (Dec. 4, 2015) (full-text).

Overview
"It is DoD policy to: [a] Conduct DoD public and private Internet-based communications (e.g., electronic mail and Web operations) under the TLD [top-level domain established for the DoD &mdash; the .mil TLD &mdash; in accordance with Reference (c). Enclosure 2 describes the delegation of this TLD to the DoD and the purpose of other major TLDs. Enclosure 3 lists exceptions and situations that may warrant special approval for the use of other TLDs. [b] Use the .mil domain to provide names only for IP addresses allocated or assigned to the DoD by the American Registry for Internet Numbers."