The Postal Operations System (POS) for MARFORRES receives and sends official mail for 116 sites.  The mail rooms at each of these locations vary in capacity and are governed by Title 39, U.S. Code, DoD Instruction 4525.6-M, OpNav Instruction 5118.7C and Marine Corps Order 5110.4A; requiring reporting, accountability, and fiscal responsibility.  All system requirements must be fully operational and functional no later than the beginning of the business day on 3 January 2022. See PWS for details.