Security & Law Enforcement (Master-at-Arms)

About the Role

Master-at-Arms (MA) Sailors serve as the Navy's core security, antiterrorism, and law enforcement capability. They are tasked with protecting people, installations, ships, and strategic assets both at home and abroad. The role encompasses force protection, physical security, and policing across diverse environments, including bases, ships at sea, and expeditionary settings. MAs may also specialize in critical areas such as military working dogs, harbor security, corrections, investigations, or protective services.

What to Expect

You will work in a fast-paced, armed, and safety-critical environment where attention to detail, sound judgment, and professionalism are essential. The role demands frequent duty in rotating shifts, including nights, weekends, and holidays, to ensure 24/7 security coverage. You will face stressful situations involving emergencies, accidents, or criminal activity, requiring calm decision-making and strong communication skills. As you progress, you will undergo ongoing qualification and requalification in weapons, use of force, tactical skills, and physical fitness. Responsibility increases over time as you qualify for specialized billets such as patrol supervisor, watch commander, kennel master, or investigator.

Work Environment

Assignments vary widely, ranging from Navy installations in the U.S. and overseas to aircraft carriers, other ships, and expeditionary security units. You will work primarily on bases, piers, flight lines, harbor security boats, and in patrol vehicles, kennels, armories, and security operations centers. The role offers opportunities for overseas, forward-deployed, and dependent-restricted tours that count as sea duty for rotation. You will work in close integration with other security forces, Marine units, NCIS, and joint or host-nation partners, depending on your specific billet.

Pathways, Training & Advancement

Your journey begins with Recruit Training followed by Master-at-Arms Class "A" School at Lackland AFB, where you will learn the fundamentals of law enforcement, weapons handling, antiterrorism, patrol procedures, and security operations. Advancement is driven by progressive on-the-job qualification through Personnel Qualification Standards, watchstations, and unit training. Opportunities exist for advanced schools awarding Navy Enlisted Classifications such as Military Working Dog Handler, Harbor Security Coxswain, Corrections Specialist, and Criminal Investigator. Career-long development is supported by leadership courses, warfare qualifications, and senior enlisted leader programs.

Application & Eligibility

To join the Master-at-Arms community, you must meet general enlistment standards, including U.S. citizenship or eligible legal residency, a high school diploma, and specific age, medical, vision, and dental requirements. A clean legal history and strong moral character are mandatory due to the armed nature of the duties. You must be eligible for a security clearance and capable of meeting the Navy's physical fitness standards and qualifying with small arms.

Reserve opportunities may exist for qualified prior-service or SELRES applicants, often requiring completion of MA "A" School or equivalent training. Prior-service Sailors from other ratings may also be able to convert into MA based on community needs and screening.

Equal Opportunity

The U.S. Navy is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.