Security & Law Enforcement (Master-at-Arms)

About the Role

Master-at-Arms (MA) Sailors form the backbone of the Navy's security, antiterrorism, and law enforcement capabilities. Their mission is to protect people, installations, ships, and strategic assets both at home and abroad. Operating in a fast-paced, armed, and safety-critical environment, MAs provide force protection, physical security, and policing across diverse settings including bases, piers, ships at sea, and expeditionary environments.

The role demands high levels of attention to detail, sound judgment, and professionalism. MAs stand sentry, control access to secure areas, and conduct inspections to detect weapons or contraband. They enforce regulations, investigate incidents, and manage crowds during emergencies. The work often involves exposure to stressful situations requiring calm decision-making and strong communication. Over time, Sailors take on increasing responsibility, qualifying for specialized billets such as patrol supervisor, watch commander, or investigator.

Work Environment

Assignments vary widely, ranging from Navy installations in the U.S. and overseas to aircraft carriers and strategic weapons facilities. MAs work primarily on bases, piers, flight lines, and in patrol vehicles, kennels, armories, and security operations centers. The role frequently requires duty in rotating shifts, including nights, weekends, and holidays, to ensure 24/7 coverage.

Opportunities exist for overseas, forward-deployed, and dependent-restricted tours that count as sea duty. MAs work in close integration with other security forces, Marine units, NCIS, and joint or host-nation partners depending on the specific billet.

Training & Career Path

Recruits begin with Recruit Training followed by Master-at-Arms Class "A" School at Lackland AFB. There, they learn the fundamentals of law enforcement, weapons handling, antiterrorism, and security operations. Career development is progressive, involving on-the-job qualification through Personnel Qualification Standards and unit training.

Sailors have opportunities to attend advanced schools to earn Navy Enlisted Classifications in specialized fields such as Military Working Dog Handler, Harbor Security Coxswain, Corrections Specialist, and Criminal Investigator. Career-long development includes leadership courses, warfare qualifications, and senior enlisted leader programs.

Application & Eligibility

To join the Master-at-Arms community, applicants must meet general enlistment standards, including U.S. citizenship or eligible legal residency, a high school diploma, and specific age limits. Candidates must pass medical, vision, and dental standards, including body composition and physical fitness requirements, and meet character and conduct standards through background screening.

Additional qualifications for this role include a clean legal history suitable for armed law enforcement duties, the ability to qualify with small arms, and a willingness to work rotating shifts, deploy, and accept assignment to sea duty or overseas locations. Eligibility for a security clearance is required for most billets.

Equal Opportunity

The 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.