7320 vs MM
Clinical Psychologist (USN) vs Machinist's Mate (USN)
The Navy told both of these they were "the backbone of the fleet." That skeleton apparently has a lot of backbones.
If 7320 had a dating profile, it would mention: the recruiter said 'you'll provide world-class mental health care to the fleet,' which is true — your clinical training is excellent, and your patient population provides the kind of experience civilian psychologists only read about in textbooks. If MM had one: maritime civilian employment — merchant marine engineering, shipyard work, power plant operations — is the most direct pipeline. One military. Two MOS codes that swiped right on completely different career experiences. The career counselor's PowerPoint had both of these on the same slide under "opportunities." Technically correct.
After the Uniform
The part the recruiter skips: what each job actually translates to once you're a civilian — and what it pays.
Salary data from the U.S. Bureau of Labor Statistics Occupational Employment and Wage Statistics program. A guide, not a guarantee.
Recruiter vs. Reality
The pitch versus what people who actually did the job report back.
“Navy Clinical Psychologists serve where mental health care matters most — supporting warriors and their families. You'll treat everything from PTSD to operational stress, often in deployed environments. The clinical experience is unmatched and the mission is deeply meaningful.”
You are a Navy Clinical Psychologist, which means you have a doctoral degree and a commission, and your patients range from sailors with anxiety and adjustment disorders to SEALs managing combat trauma to submarine crews who just spent six months in a steel tube with no sunlight. The recruiter said 'you'll provide world-class mental health care to the fleet,' which is true — your clinical training is excellent, and your patient population provides the kind of experience civilian psychologists only read about in textbooks. You conduct fitness-for-duty evaluations that determine whether someone can stay in uniform, provide therapy in environments where the stigma of mental health care is still very real, and write psychological assessments that influence security clearance decisions. The military needs you desperately and will occasionally pretend it doesn't. You are fighting a cultural battle as much as a clinical one.
“You'll run the engine room of a United States Navy warship — the propulsion plant that keeps everything moving. Steam turbines, gas turbines, reduction gears, and auxiliary systems that take years to master. MM is one of the most technically demanding ratings in the Navy, and when you get out, the commercial shipping industry and the USCG Marine Engineer license pathway are waiting. A licensed marine engineer on a deep draft vessel earns more than most college graduates ever will. This is a trade the Navy will actually teach you.”
On a nuclear carrier or submarine, you may go nuclear-qualified and operate a reactor plant, which is an entirely different career track with its own pipeline, screening, and lifestyle implications. On a conventional surface ship — a DDG, CG, or LPD — you are the engineer who keeps the LM2500 gas turbine engines running, which means you live in the engineering spaces that are loud, hot, and smell like a specific combination of JP-5, hydraulic fluid, and institutional suffering. Main reduction gears, lube oil systems, seawater cooling, auxiliary machinery: the engineering plant of a naval vessel is a system of systems and you need to understand all of them because they interact in ways that become apparent only when something fails. The engineering logs you maintain are legal documents. The watchstanding qualification process is demanding in a way that produces genuine competence. Steam plant experience on carriers and amphibious ships is rarer than it used to be but still exists. Maritime civilian employment — merchant marine engineering, shipyard work, power plant operations — is the most direct pipeline. The USCG licensing pathway for marine engineer is designed to accommodate exactly your background. What you know about high-pressure steam systems is worth something the civilian world cannot easily replicate.
The Real Life
Same dimensions, side by side. 7320 on the left, MM on the right.
Providing clinical psychological services — therapy, psychological testing, diagnostic assessment, fitness-for-duty evaluations, and command consultation. Patients range from sailors and Marines with anxiety, depression, and adjustment disorders to combat veterans with PTSD and traumatic brain injury. You also conduct security clearance psychological evaluations and advise commanders on unit psychological health.
Operating and maintaining the ship's propulsion plant, auxiliary systems, and mechanical equipment. MMs run the engine room — steam turbines, gas turbines, pumps, valves, air conditioning, and hydraulic systems. On a ship: standing engineering watches, responding to engineering casualties, and performing continuous maintenance. The engine room is hot, loud, and the watch schedule is relentless.
Requires a doctoral degree (PhD or PsyD) in clinical psychology and completion of an APA-accredited internship. Most Navy clinical psychologists enter through the Health Professions Scholarship Program (HPSP) or direct accession after completing their doctorate. ODS at Newport, RI is 5 weeks. Military-specific training covers operational psychology, combat stress, and fitness-for-duty evaluation procedures.
A School at Great Lakes (IL) is about 12 weeks. Covers mechanical fundamentals, fluid dynamics, thermodynamics, propulsion systems, and auxiliary machinery. Nuclear-designated MMs attend the nuclear power training pipeline (additional 18+ months at Charleston, SC and prototype in NY or SC).
Low. Clinical work is office-based. Operational psychology billets with Marines or SOF may involve field conditions.
High. Engine room work involves heat, noise, confined spaces, and heavy lifting. Operating and maintaining propulsion machinery, pumps, valves, and auxiliary systems is physically demanding.
Navy Clinical Psychologist is a career that combines doctoral-level clinical expertise with military service, and the patients you see will give you clinical experience that civilian psychologists only read about in journals. The recruiter (or HPSP recruiter) will highlight the debt-free education and unique patient population — both are real. What they won't tell you: the military still has significant stigma around mental health, and some of the service members who need you most will resist treatment because they fear career consequences. Fitness-for-duty evaluations put you in the position of deciding whether someone keeps their career, which is clinically and ethically complex. The caseload can be overwhelming, especially at large MTFs. The civilian transition is straightforward — you're a licensed clinical psychologist with board certification and experiences that enrich your practice. VA, private practice, and academic positions all value military clinical psychology experience. If you want to practice psychology where it matters most, this is the place.
Machinist's Mate is the workhorse of the engineering department, and the job is exactly as demanding as it sounds. The recruiter will tell you about engineering and propulsion — and you will learn those things. What they won't tell you: the engine room is a miserable work environment. It's 100-120 degrees, deafeningly loud, and you stand watches around the clock. The equipment is often decades old and the maintenance is endless. But there's genuine pride in keeping the plant running, and the mechanical skills are real. Nuclear MMs (MMN) have one of the best post-military career paths in the entire military — nuclear power plants and utilities pay $80K+ starting. Conventional MMs have a solid but narrower path into industrial maintenance, HVAC, and maritime engineering. The rate will break your body down if you're not careful, but you'll leave knowing how machines actually work.
Recent Reviews
Community Takes
Be the first to share your take on 7320 vs MM
Compare Other MOS
Search by code or title, or browse by branch