Is MCO 5401.1 current?

MCO 5401.1 is listed as current in the MCPEL catalog (publication date 2023-10-02).

Where do I download the official MCO 5401.1?

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

MCO 5401.1 — CONCEPT GENERATION AND DEVELOPMENT

MCO 5401.1 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	2023-10-02 (2.8 years ago)
Status	Current
Proponent / OPR	Not listed
Source of record	MCPEL

Official document (MCPEL)

Watch this publication

Get an email if MCO 5401.1 is revised, superseded, or rescinded.

Nearby in the MCO series

MCO 5400.53A — MARINE CORPS SPACE POLICY Current
MCO 5400.54 — MARINE CORPS INSTALLATIONS COMMAND ROLES AND RESPONSIBILITIES Current
MCO 5400.55 — ROLES AND RESPONSIBILITIES FOR MARINE CORPS DEFENSE POLICY REVIEW INITIATIVE FORCE POSTURE REALIGNMENT Current
MCO 5420.16D — ENLISTED REMEDIAL SELECTION BOARD (ERSB) Current
MCO 5420.25 — THE MARINE REQUIREMENTS OVERSIGHT COUNCIL (MROC) 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 5401.1 in an official product.