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MEDICAL CORPS OFFICER (2100)

The Staff Corps community of every U.S. Navy physician.

Medical Corps device — gold oak leaf with silver acorn
Insignia
Designator
2100
Abbreviation
MC
Community
Staff Corps
Paygrade Range
O-1 to O-10
NATO Range
OF-1 to OF-9
Category
Officer Designator

OVERVIEW

The 2100 Medical Corps designator identifies Staff Corps officers in the U.S. Navy who are licensed physicians (MD or DO). Medical Corps officers serve as primary-care physicians, subspecialty surgeons, flight surgeons, undersea medical officers, and operational medical officers across the Navy and Marine Corps. They staff Navy hospitals, Navy clinics, ships, submarines, aircraft carriers, Fleet Marine Force units, expeditionary medical units, and joint medical commands.

Most Medical Corps officers commission via the Health Professions Scholarship Program (HPSP), the Health Services Collegiate Program (HSCP), or as direct accessions following completion of medical school. Many continue residency and fellowship training at Naval Medical Center Portsmouth, Naval Medical Center San Diego, or in joint Navy-Army programs at Walter Reed National Military Medical Center.

RESPONSIBILITIES

  • Provide primary-care or subspecialty medical care to Sailors, Marines, and beneficiaries
  • Serve as flight surgeon for a Navy aviation squadron or undersea medical officer for a submarine squadron
  • Lead a Navy medical department aboard a ship, expeditionary unit, or hospital
  • Conduct medical research, residency training, and military medical education

HISTORY

The U.S. Navy established the Medical Corps in 1871, formalizing centuries of Navy medical practice that had operated under various titles since the founding of the Navy in 1775. Medical Corps officers played critical roles in every major U.S. conflict — from yellow-fever research aboard ships in the Spanish-American War, to the founding of the Navy aviation medicine specialty after WWI, to the modern combat-casualty-care advances of Iraq and Afghanistan.

Today the Medical Corps fields more than 4,000 active-duty physicians and is the lead Navy Staff Corps for Navy Medicine.

COMMISSIONING SOURCES

  • Health Professions Scholarship Program (HPSP)
  • Health Services Collegiate Program (HSCP)
  • Direct Accession
  • Uniformed Services University (USUHS)

TRAINING PIPELINE

  1. 1. Officer Development School (ODS)~5 weeks
    Naval Station Newport, RI
    Direct-commission officer indoctrination required for all Staff Corps accessions.
  2. 2. Operational Medicine Indoctrination Course~2–4 weeks
    NMC Portsmouth, VA / NMC San Diego, CA
    Operational medicine, casualty care, and Navy/Marine medical practice.
  3. 3. Specialty Residency / Fellowship3–7 years
    Navy or joint teaching hospital
    Civilian-equivalent ACGME-accredited residency in chosen specialty.

TYPICAL CAREER PATH

  1. O-3
    Internship / Residency
    Most newly-commissioned MC officers begin internship and residency at a Navy or joint teaching hospital.
  2. O-3/O-4
    Operational Tour or Specialty Practice
    GMO with the Fleet Marine Force, flight surgeon, or subspecialty practice at a Navy hospital.
  3. O-5
    Department Head
    Department head at a Navy hospital, clinic, or operational unit.
  4. O-6
    Hospital / Clinic Commanding Officer
    Command of a Navy hospital, clinic, or major Navy Medicine staff role.
  5. O-7+
    Senior Navy Medicine Leadership
    Flag officer leadership in Navy Medicine, the Defense Health Agency, or as Surgeon General of the Navy.

RELATED DESIGNATORS

RELATED BASES

How to address
Verbally "Doctor Smith" or by underlying rank — e.g., "Captain Smith, MC, USN."
Prerequisites
  • Doctor of Medicine (MD) or Doctor of Osteopathy (DO) from an accredited medical school
  • Active state medical license (any U.S. state)
  • Successful completion of Officer Development School (ODS) at Naval Station Newport
  • Maintain Secret clearance and operational fitness for assigned duty
Common assignments
  • General Medical Officer (GMO) aboard a ship, submarine, or with a Marine Corps unit
  • Flight Surgeon for a Navy or Marine Corps aviation squadron
  • Subspecialty physician at a Navy hospital (Portsmouth, San Diego, Bethesda)
  • Joint medical staff at Walter Reed or Defense Health Agency

FREQUENTLY ASKED QUESTIONS

The 2100 designator identifies a Staff Corps officer in the Navy Medical Corps — a licensed physician (MD or DO) serving in the U.S. Navy.

Yes. Most MC officers serve at least one operational tour at sea, with Marine Corps units, aviation squadrons, or expeditionary medical units. Subspecialty physicians frequently deploy with hospital ships USNS Mercy and USNS Comfort.

The most common path is the Health Professions Scholarship Program (HPSP), which pays for medical school in exchange for service. Alternative paths include direct accession after completing medical school and the Uniformed Services University (USUHS) in Bethesda, MD.

SOURCES

Last updated 2026-05-02
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