The MML is a library of core online resources, accessible to MHS personnel. Personnel at Medical Treatment Facilities (MTFs) with libraries access this content via their library, but personnel unaffilitated with an MTF library can access information at the MML. It requires CAC authentication for access.
From the MML page: "The MML provides access to high-quality, evidence-based medical, nursing, and allied health information resources for MHS personnel. The MML ensures that all personnel have access to core, essential resources regardless of duty station."
You can access the page here: https://info.health.mil/edu/jmesi/MML/Pages/HOME.aspx