Background: Navy Hospital Corpsmen are the frontline enlisted medical providers for U.S. Marines, often practicing independently in austere environments. Previous assessments revealed limited clinical sustainment, inadequate procedural training, and confidence mismatches between supervisors and Corpsmen. Current training pipelines, including A-school and Field Medical Training Battalion (FMTB), provide limited preparation for Role 1 and Role 2 responsibilities. To address these readiness gaps, we conducted a Quality Improvement project to design a Personal Qualification Standard (PQS) for Corpsmen, using operational input from III Marine Expeditionary Force (III MEF). Methods: A cross-sectional survey was distributed across III MEF to Marines, Corpsmen, and medical supervisors. Domains included procedural expectations, treatment and diagnosis capabilities, medication prescribing authority, and sustainment modalities. Responses were collected on a 5-point Likert scale (1 = not capable, 5 = completely capable). Data were stratified by pay grade (E1–E7) to determine progressive competence thresholds. The project was reviewed by the U.S. Marine Corps Human Research Protection Program and determined not to be Human Subjects Research. Results: A total of 206 respondents participated (38 medical supervisors, 110 Corpsmen, 52 Marines). * Procedural competence: Respondents supported Corpsmen independently performing suturing, abscess drainage, and nail removal by mid-career, with earlier ranks assisting under supervision. * Diagnostic capability: Strong expectations were identified for managing common conditions (heat stroke, gastroenteritis, URI), while appendicitis, necrotizing fasciitis, and cancer syndromes were deemed outside Corpsman scope. * Medication authority: Consensus supported Corpsmen prescribing over-the-counter medications and select oral antibiotics, but not narcotics, ketamine, or chemotherapy agents. * Sustainment: High value was placed on simulation training, mass casualty drills, and structured checklists to maintain competency. Conclusions: Survey findings informed a tiered PQS for Navy Corpsmen, aligning procedural, diagnostic, and prescribing authority with rank and operational needs. The PQS establishes measurable competency gates and sustainment mechanisms to improve readiness and patient care in distributed maritime and expeditionary operations.