SECNAV Instruction 3052.2: Cyberspace Policy and Administration within the Department of the Navy [open pdf - 104KB]
The purpose of this instruction is to "establish policies and responsibilities for the administration of cyberspace within the Department of the Navy (DON) consistent with references (a) through (h). [...] To designate the Under Secretary of the Navy as the DON Chief Cyberspace Officer."
SECNAVINST 3052.2; Secretary of the Navy Instruction 3052.2
Department of the Navy Issuances: http://doni.daps.dla.mil/default.aspx