Is MCO 5100.34A current?

MCO 5100.34A is listed as current in the MCPEL catalog (publication date 2017-06-19).

Where do I download the official MCO 5100.34A?

The official copy is published on MCPEL (https://www.marines.mil/News/Publications/MCPEL/).

Home / Marine Corps / MCO / MCO 5100.34A

MCO 5100.34A — DEADLINE SAFETY OF USE MESSAGE INSTRUCTIONS TO SUSPEND OPERATIONS OF MARINE CORPS GROUND EQUIPMENT AND WEAPONS SYSTEMS, SAFETY OF USE MESSAGES AND MAINTENANCE ADVISORY MESSAGES

MCO 5100.34A is listed as current Current
in the MCPEL catalog as of our last index refresh (2026-07-11). Note: its publication date is 2017-06-19 — 9 years old — so check for newer interim changes before citing it.

Branch	U.S. Marine Corps
Series	MCO
Publication date	2017-06-19 (9.1 years ago)
Status	Current
Proponent / OPR	Not listed
Source of record	MCPEL

Official document (MCPEL)

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Nearby in the MCO series

MCO 5090.2 — ENVIRONMENTAL COMPLIANCE AND PROTECTION PROGRAM Current
MCO 5090.4A — CONSERVATION LAW ENFORCEMENT PROGRAM Current
MCO 5100.29C VOLUMES 1-9 w/CH-2 — MARINE CORPS SAFETY MANAGEMENT SYSTEM (MCSMS) Current
MCO 5100.8 — MARINE CORPS OCCUPATIONAL SAFETY AND HEALTH (OSH) POLICY ORDER Current
MCO 5104.1_ — NAVY LASER HAZARDS CONTROL PROGRAM Current

This is an unofficial index built from the public catalog. The controlling copy is always the one on MCPEL — verify there before citing MCO 5100.34A in an official product.