R 281609Z JAN 26 MARADMIN 028/26 MSGID/GENADMIN/DC T&E QUANTICO VA// SUBJ/Q4FY25 and Q1FY26 APPROVED DOCTRINE AND TRAINING PUBLICATIONS// REF/A/MCO/5600.31B/ARDE/17JAN18// NARR/REF (A) IS MARINE CORPS PRINTING, PUBLISHING, AND REPROGRAPHICS EQUIPMENT REGULATIONS// POC/D. HEINZE/CIV/MAGTFTC/MCTOG/TEL: COMM: (760)672-9539/EMAIL: [email protected]// POC/J. CAMPBELL/CIV/MEXWD/TEL: COMM (703)432-4732/EMAIL: [email protected]// POC/W. LAMBUTH/LTCOL/ASSAULT AMPHIBIAN SCHOOL/ TEL: (760) 763-3005/EMAIL: [email protected]// POC/G. GERICHTEN/CIV/MARINE CORPS ENGINEER SCHOOL/ TEL: (910) 440-6010/EMAIL: [email protected]// POC/J. GOLDMAN/CIV/PP&O/TEL: (808) 692-4340/EMAIL: [email protected]// POC/C. BEVAN/CIV/MCLOG/EMAIL: [email protected]// POC/R.  FITZSIMMONS/CIV/TECOM/TRAINING STANDARDS DIVISION (TSD)/DOCTRINE BRANCH(DB)/TEL:  COMM (703)432-8493/EMAIL: [email protected]// POC/T.  HARTSHORNE/CIV/TECOM/TSD/DB/TEL:  COMM (703)432-1931/ EMAIL: [email protected]// GENTEXT/REMARKS/1.  The following Marine Corps doctrine and training publications were approved during Q4FY25 and Q1FY26. Unless otherwise stated, the publications are available via the Marine Corps Doctrine website at https:(slant slant)usmc. sharepoint-mil.us(slant)sites(slant)MCEN_Support_MCDoctrine. Readers with a valid common access card unable to access the publications can request enhanced permissions from the Marine Corps doctrine website by scrolling to and clicking “Can’t Find a Publication?” and following the instructions.  Those without government access can view unrestricted USMC Doctrine on the Marine Corps Publications Electronic Library (MCPEL) at https: (slant slant)www.marines.mil(slant)News(slant)Publications(slant). To provide publication feedback, email the appropriate manager point of contact shown above.  Send other requests for assistance to [email protected]. 1.a.  Marine Corps Reference Publication (MCRP) 3-10C.1, Amphibious Combat Vehicle Company, was signed on 10 December 2025.  This publication provides a foundational basis for employment and sustainability within an assault amphibian structure while supporting a mechanized infantry company.  This publication supersedes MCRP 3-10C.1, Amphibious Combat Vehicle Employment, dated 8 July 2022. 1.b.  MCRP 3-40B.6, Multi-Service Tactics, Techniques, and Procedures (MTTP) for Operational Contract Support, was signed on 2 December 2025.  This multi-Service publication focuses on tactical and operational-level Service component functions and includes limited information on component-level headquarters’ unique operational contract support staff organization and capabilities. It also contains an overview of Service-unique theater support, external support, and systems support contracting capabilities. This publication supersedes MCRP 3-40B.6, MTTP for Operational Contract Support, dated 16 December 2021, and Change 1, dated 7 March 2023. 1.c.  MCRP 3-40D.14, Water Support Operations, was signed 16 Sept 2025.  This multi-Service publication provides doctrinal guidance and direction for United States Army and United States Marine Corps units conducting water support operations.  This publication supersedes MCRP 3-40D.14, Water Support Operations, dated 16 December 2022. 1.d.  Marine Corps Tactical Publication (MCTP) 3-03D, Security Cooperation, was signed 2 September 2025.  This publication outlines Marine Corps security cooperation guidance, concepts, lexicon, and planning considerations, including legal and political issues, available tools and resources, and the Security Cooperation Planning and Execution Cycle.  This publication supersedes MCTP 3-03D, Security Cooperation dated 1 August 2020. 1.e.  MCTP 3-40A, Health Service Support, was signed on 2 September 2005.  This publication provides a conceptual understanding of health service support capabilities, planning considerations, command relationships, support requirements, and considerations for the successful execution of missions throughout the competition continuum.  This publication supersedes MCTP 3-40A, Health Service Support Operations, dated 10 December 2012; its erratum, dated 2 May 2016; Change 1, dated 4 April 2018; MCRP 3-40A.5, Health Service Support Field Reference Guide, dated 8 October 2015; its erratum, dated 2 May 2016; and Change 1, dated 4 April 2018. 1.f.  MCRP 12-10A.1, Small-Unit Leader’s Guide to Mountain Warfare, was approved on 6 August 2025.  This publication is a reference for Marine leaders (team through company) to use when conducting operations in mountainous terrain, snow, cold weather, and at high altitudes.  This publication supersedes MCRP 12-10A.1, Small Unit Leader’s Guide to Cold Weather Operations, dated 21 May 2013; erratum dated 2 May 2016; and change 1 dated 4 April 2018. 1.g.  MCRP 3-20F, Ground-Based Air Defense, was approved on 30 July 2025.  This publication describes the low altitude air defense  (LAAD) battalion and littoral anti-air battalion (LAAB) ground-based air defense (GBAD) battery and their mission, organization, command relationships, and support relationships.  This publication supersedes MCRP 3-20F.8, Low Altitude Air Defense Battalion Handbook dated 13 November 2020. 2.  Coordinating Instructions.  Units can request hard copy publications via the address listed in paragraph 1.  Print requirements for publicly releasable publications are outlined in reference (a), paragraphs 4.A.2.B and 4.A.2.C.  Publication control numbers (PCNs), limited dissemination controls (LDCs), and managers are: 2.a.  MCRP 3-10C.1, Amphibious Combat Vehicle Company 2.a.1.  PCN: 144 000291 02 2.a.2.  LDC: None.  Approved for Public Release. 2.a.3.  Manager: Assault Amphibian School 2.b.  MCRP 3-40B.6, MTTP for Operational Contract Support 2.b.1.  PCN: 144 000230 02 2.b.2.  LCD: None.  Approved for Public Release. 2.b.3.  Manager: Training Standards Division (TSD) 2.c.  MCRP 3-40D.14, Water Support Operations 2.c.1.  PCN: 144 000196 02 2.c.2.  LDC: None.  Approved for Public Release. 2.c.3.  Manager: Marine Corps Engineer School 2.d.  MCTP 3-03D, Security Cooperation 2.d.1.  PCN: 147 000087 01 2.d.2.  LCD: None.  Approved for Public Release. 2.d.3.  Manager: PP&O (PLU) 2.e.  MCTP 3-40A, Health Service Support 2.e.1.  PCN: 147 000069 01 2.e.2.  LCD: None.  Approved for Public Release. 2.e.3.  Manager: Marine Corps Logistics Operations Group 2.f.  MCRP 12-10A.1, Small-Unit Leader’s Guide to Mountain Warfare 2.f.1.  PCN: 144 000125 01 2.f.2.  LDC: None.  Approved for Public Release. 2.f.3.  Manager: Marine Corps Mountain Warfare Training Center 2.g.  MCRP 3-20F, Ground-Based Air Defense. 2.g.1.  PCN: 144 000248 01. 2.g.2.  LDC: None.  Approved for Public Release. 2.g.3.  Manager: Marine Aviation Weapons and Training Squadron-One. 3.  The following publications have been archived or cancelled. These archival actions will be recorded in the next Marine Corps Bulletin 5603 release: 3.a.  MCRP 3-40B.3, Contingency Contracting.  This publication was archived in December 2025 upon approval of MCRP 3-40B.6, Operational Contract Support. 3.b.  MCRP 3-30.6, MTTP for Defense Support of Civil Authorities (DSCA).  This Air, Land, Sea, Space, Application (ALSSA) Center publication was archived in September. 3.c.  MCRP 3-40A.5, Health Service Support Field Reference Guide, was cancelled in September 2025 upon publication of MCTP 3-40A, Health Service Support, which consolidates information from both into a single publication. 3.d.  MCRP 3-20F.8, Low-Altitude Air Defense Handbook, was archived in July 2025 with the publication of MCRP 3-20F.8, Ground-Based Air Defense. 4.  Readers can provide feedback on Marine Corps doctrine and training publications to [email protected]. 5.  This MARADMIN is applicable to the Marine Corps Total Force. 6.  Release authorized by Lieutenant General Benjamin T. Watson, Deputy Commandant for Training and Education.//