Is MCO 3100.4A current?

MCO 3100.4A is listed as current in the MCPEL catalog (publication date 2026-03-25).

Where do I download the official MCO 3100.4A?

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

MCO 3100.4A — MARINE CORPS CYBERSPACE OPERATIONS

MCO 3100.4A is listed as current Current
in the MCPEL catalog as of our last index refresh (2026-07-11).

Branch	U.S. Marine Corps
Series	MCO
Publication date	2026-03-25 (0.3 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 3090.2 — POLICY FOR MARINE AIR GROUND TASK FORCE (MAGTF) COMMAND AND CONTROL (C2) INTEGRATION AND INTEROPERABILITY Current
MCO 3093.3 — MARINE CORPS POLICY FOR COORDINATED IMPLEMENTATION OF MILITARY STANDARDS 6017, 2045-47001, AND 188-220 Current
MCO 3093.4 — MARINE CORPS POLICY FOR ASSIGNMENT, MANAGEMENT, AND OPERATIONAL USE OF THE VARIABLE MESSAGE FORMAT UNIT REFERENCE NUMBER Current
MCO 3104.1B — MARINE CORPS COMBAT CAMERA PROGRAM Current
MCO 3110.5 — MILITARY INFORMATION SUPPORT OPERATIONS (MISO) 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 3100.4A in an official product.