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MCO P3121.1 — MARINE CORPS PLANNING AND PROGRAMMING MANUAL

MCO P3121.1 is listed as current Current
in the MCPEL catalog as of our last index refresh (2026-08-23). Status is mirrored from that catalog, re-checked weekly — every change is logged. Note: its publication date is 1991-10-01 — 34.9 years old — so check for newer interim changes before citing it.

Branch	U.S. Marine Corps
Series	MCO
Publication date	1991-10-01 (34.9 years ago)
Status	Current
Proponent / OPR	Not listed
Source of record	MCPEL

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Nearby in the MCO series

MCO P1700.27B W/CH-1 — MARINE CORPS COMMUNITY SERVICES POLICY MANUAL (SHORT TITLE: MCCS POLICY MANUAL) Current
MCO P1710.16E — MARINE CORPS AERO CLUB PROGRAM MANUAL Current
MCO P3000.15B — MANPOWER UNIT DEPLOYMENT PROGRAM STANDING OPERATING PROCEDURES (SHORT TITLE: MANPOWER UDP SOP) Current
MCO P3500.72A W/ ADMIN CH-1 — MARINE CORPS GROUND TRAINING AND READINESS (T&R) PROGRAM Current
MCO P4030.21_ — PACKAGING OF MATERIEL PRESERVATION 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 P3121.1 in an official product.