Marine Corps Adopts GenAI.mil as Official AI Platform, Retiring Older Systems

The U.S. Marine Corps has officially designated GenAI.mil as its preferred large language model platform, a strategic move that distances the service from older AI systems owned and operated by other military branches. This landmark decision makes GenAI.mil the first true enterprise solution for Marines to leverage generative AI capabilities across the entire force. But what does this mean for the future of AI adoption in the military, and how will it transform the way Marines work and operate?

A New Era for Military AI

In a force-wide message published this week, the Corps announced that GenAI.mil—the Pentagon’s recently launched hub for commercial large language models—is now authorized for all Marines, civilians, and contractors to use. Until this point, there was no enterprise solution for USMC users, Capt. Christopher Clark, the service’s AI lead, told DefenseScoop. This strategic alignment with GenAI.mil represents a fundamental shift in how the Marine Corps approaches artificial intelligence deployment across its ranks.

Moving Beyond Legacy Systems

The Marine Corps announcement follows the release of the Defense Department’s aggressive new AI strategy aimed at proliferating LLMs across the military. It also comes as older military AI systems get sidelined to make way for the new platform. This transition mirrors similar moves by other services, as the Air Force was recently reported to be sidelining NIPRGPT, the LLM it owned and operated. However, the Marine Corps emphasized that prioritizing GenAI.mil does not limit the use of other LLMs, such as the Army-managed CamoGPT, giving commanders flexibility in how they adopt AI tools.

Commercial Models Leading the Way

Google’s Gemini was the first commercial AI model introduced to GenAI.mil, providing Marines access to cutting-edge generative AI capabilities. Defense Secretary Pete Hegseth announced earlier this month that the GrokAI tool will also join GenAI.mil, expanding the range of available models despite controversies surrounding the platform. Following the breakneck release of GenAI.mil, the platform was met by troops and department officials with mixed reviews, with some users adopting it for basic administrative tasks while others remained cautious about the new technology.

Responsible AI Adoption

The Marine Corps is taking a measured approach to AI implementation, recognizing the potential risks associated with these emerging technologies. GenAI tools are non-deterministic and may produce inaccurate, biased, or incomplete information, the new Marine Corps message warned under a user responsibility and accountability section. All personnel are responsible for critically evaluating and verifying any output from GenAI.mil before using it for official purposes in accordance with guidance released by the service last year. This emphasis on human oversight ensures that AI augments rather than replaces human judgment in critical decision-making processes.

Building an AI-Ready Force

Last spring, the Marine Corps released a comprehensive AI implementation plan which sought to empower Marines with knowledge, skills, and tools to rapidly implement AI and accelerate the integration of these systems across the force. The document outlined that by this spring, key Corps leaders would develop a use case process that captures, assesses, and prioritizes concepts for AI application from across all warfighting functions. The service will consolidate all duplicative, general-purpose usage onto GenAI.mil, streamlining operations while maintaining flexibility for specialized applications that serve unique Marine Corps missions.