MCO 5110.4B — Marine Corps Postal Affairs And Official Mail Program

MCO 5110.4B governs military post office operations, unit mailrooms, postal service centers, and the official mail program.

Search MCO 5110.4B

  • Publication number: MCO 5110.4B
  • Title: MARINE CORPS POSTAL AFFAIRS AND OFFICIAL MAIL PROGRAM
  • Date: 9 Dec 2021
  • Proponent: 05000 General Admin & Management
  • Status: Current

View MCO 5110.4B on armypubs.army.mil

The publication covers mail privacy and security, absentee ballots, directory service, receptacle delivery, postage management, and suspicious mail. It requires controls for postal expenditures, secure handling and delivery of mail, and specific processing and reporting procedures.

Topics covered

  • Military post office operations
  • Unit mailroom operations
  • Postal service centers
  • Official mail program
  • Absentee ballots
  • Directory service
  • Mail privacy and security
  • Suspicious mail

Questions and answers

How quickly must postal activities respond to customer complaints and inquiries?

Postal activities must monitor/reply to customer complains/inquiries within 30 days of receipt via the local Interactive Customer Evaluation System. (paragraph 4)

When may sealed mail be opened, read, searched, or disclosed?

Without a properly executed search warrant or inspection by a military customs official – no person may open, read, search, or divulge the contents of mail sealed against inspection. (paragraph 1-4)

How long may absentee ballot material be held for personnel who have not arrived?

Hold material for personnel due to arrive within 30 days. Do not hold material for more than 30 days. (paragraph 1-5)

When must a unit mailroom be locked?

The UMR must be locked when the Unit Mail Clerk is not present. (paragraph 8)

How long can a temporary mail disposition form remain authorized?

DD Form 2258 is not authorized for more than 90 days from the effective date. (paragraph 2-5)

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