R 101236Z APR 26 MARADMIN 167/26  MSGID/GENADMIN/CMC CDI WASHINGTON DC//  SUBJ/PUBLICATION AND AVAILABILITY OF FIRST TO FIGHT: A CAPSTONE  OPERATING CONCEPT//  REF/A/MSGID: MCO/CMC/YMD: 20231002//   NARR/REF A IS MCO 5401.1, CONCEPT GENERATION AND DEVELOPMENT//  POC/A. H. ARMSTRONG/LTCOL/MCWL FUTURES AND  CONCEPTS/[email protected]//  GENTEXT/REMARKS/1. In January 2026, the Commandant of the  Marine Corps approved First to Fight: A Capstone Operating Concept.  The concept can be accessed via the following links:  1.a. Unclassified executive summary:  https:(slash)(slash)usmc.sharepoint- mil.us/sites/DCCDI/SitePages/Final_Reports.aspx  1.b. Classified concept library:  https:(slash)(slash)intelshare.intelink.sgov.gov/sites/cdi/SitePages /FinalReportsLibrary.aspx  2. Background. First to Fight: A Capstone Operating Concept  reinforces our enduring commitment to serve as the premier  expeditionary force in-readiness of the United States, preparing to defeat our nations’ adversaries in any clime and place. Sustaining this vision requires accelerated modernization to ensure Marines are fully trained, organized, and equipped for the rapidly evolving challenges of future warfare.  3. Purpose and Scope. First to Fight outlines the Marine Corps’  approach to operating, fighting, and winning in joint campaigns from  now to 2035. This capstone concept synthesizes approved operating  concepts, force development activities, and lessons learned into a  single, cohesive vision. Marines being first to fight, remain in  forward contested environments, and operate alongside the Navy and  joint force. Achieving this vision requires the rapid adoption of new operating methods as well as the acceleration of ongoing initiatives in how the Marine Corps operates, postures, organizes, and innovates.  4. Central Idea. First to Fight: Our Nation's Expeditionary Force in  Readiness. The Marine Corps is a globally responsive, lethal, and  resilient combined-arms naval expeditionary force that projects power from sea to land and land to sea, fighting as a Marine Air Ground Task Force across all domains in contested environments to deter, deny, and defeat adversaries. Marines conduct sea denial,  contribute to sea control, and conduct amphibious operations to deny adversary freedom of action, while extending Joint Force  commanders' operational reach. Modernized forward forces, optimized to operate in the littorals, seize and hold key maritime terrain to deliver lethal effects, sense and shape the operating  environment, and close kill webs in support of fleet maneuver and joint campaigns.  5. Operating Concepts. First to Fight adds to the library of active  Marine Corps and Naval operating concepts, which consists of:  5a. Littoral Operations in a Contested Environment (LOCE), 2017.  5.b. Concept for Expeditionary Advanced Base Operations (EABO), 2019.  5.c. A Concept for Stand-in Forces (SIF), 2021.  5.d. Concept for Naval and Special Operations Forces Operations  (CNSO), 2023.  5.e. Naval Concept for Distributed Maritime Logistics Operations  (DMLO), 2023.  5.f. Marine Corps Concept for Logistics (MCCL), 2024.  5.g. A Concept for 21st Century Amphibious Operations (21 CA0), 2025. 6. Collectively, the family of naval operating concepts is continuing to guide Marine Corps modernization. 7. This MARADMIN is applicable to the Marine Corps Total Force.  8. Release authorized by Lieutenant General Eric E. Austin, Deputy  Commandant for Combat Development and Integration.//