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The JSC website now has the MCM 2023 on line. It is accompanied with this note,

The MCM (2023 edition) incorporates amendments to Parts II through V of the MCM (2019) as made by Annex 1 of Executive Order 14103 (July 28, 2023). This edition also includes Part I and Appendix 12A from the MCM (2019 edition). Of note, the MCM (2023 edition) will not include the supplementary materials typically found within the MCM, except for a forthcoming Preface, once approved. A subsequent MCM (2024 edition) will incorporate Annexes 2 and 3 of the Executive Order and should be published no later than the end of this year. 

Also on that page is a floe chart of the new referral system courtesy of the USMC.

​Oh, and the cover is blue.