http://www.rfc-editor.org/rfc/rfc1816.txt
RFC 1816: U.S. Government Internet Domain Names, 1995-08-01T23:00:00-00:00This memo provides an update and clarification to RFC 1811. This document describes the registration policies for the top-level domain ".GOV". This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.