MOS Reclassification: How to Switch to a New Army Job

You want out of your current job and into a better one, but every answer you find drowns you in terms like “In/Out Call,” “RETAIN,” and “RCN” without explaining any of them. The move you are looking for is mos reclassification, and the first thing to know is that it is rank-protected. You keep your grade and your time in service. You change your MOS (Military Occupational Specialty), not your paycheck.

The catch is that reclass is gated by three things at the same time, not one. Your current MOS has to be overstrength enough to release you. Your target MOS has to be understrength enough to take you. And your ASVAB line score has to meet the new job's minimum.

This is the step-by-step walkthrough, in the order it actually happens. It is Army-focused because MOS is an Army term, but the Navy and Air Force have their own versions, covered at the end. Before you start, look up the line score for the MOS you want in our MOS ASVAB score requirements guide.

Step 1: Confirm You Are Eligible to Reclass

Most soldiers wash out at the gate, not the finish line. Before you pick a job or talk to anyone, check whether you can even start.

A standard reclassification has a few hard eligibility rules:

Special career fields add their own bars on top of these. MOS 51C (Acquisition NCO), for example, restricts applicants to SGT through SSG and bands them by time in service: under 10 years is eligible without a waiver, 10 to 12 years needs a waiver, and 12-plus years is ineligible.

If you clear the basics, you are ready to choose a target job. If you do not, your career counselor can tell you what is blocking you and whether a waiver exists.

Step 2: Pick a Target MOS and Check Its ASVAB Line Score

The MOS you want, not the one you have, sets the ASVAB bar. Every Army job maps to a composite score you must already meet, and a lot of soldiers pick a dream MOS before they find out it is out of reach.

The Army builds its job requirements from line scores: GT, CL, CO, EL, FA, GM, MM, OF, SC, and ST. Each one combines two to four ASVAB subtests, and each MOS requires a minimum on a specific line. MOS 51C, again, requires a GT of 110, and that one is non-waivable.

Treat the table as orientation, not gospel. Exact minimums and subtest combinations change, so confirm the current requirement for your specific MOS.

Once you have a target MOS and the score it demands, you can find out whether the door is actually open.

Step 3: See Your Career Counselor and Check the In/Out Call

Who actually starts a reclass? Not you, and not your squad leader. Every MOS reclassification runs through the career counselor, because they are the one who can read the IN/OUT call and pull your control number.

Here is what In/Out Call means in plain English. An out-call says your current MOS is overstrength, so the Army is willing to release you from it. An in-call says your target MOS is understrength, so the Army is willing to take you into it. Both have to be open at the same time for a standard reclass to work.

Your counselor checks that status inside RETAIN, the Army's automated reenlistment and reclassification system. RETAIN issues a reclassification control number (RCN), which is the green light for the whole action. HRC publishes which MOSs are open through MILPER messages, and those messages change over time.

You will work through your Installation Retention Office or the Reenlistment and Reclassification Branch. Start there before you contact anyone at HRC directly.

When the counselor confirms both calls are open and pulls your RCN, you are cleared to move, assuming your score is where it needs to be.

Step 4: Retake the ASVAB (AFCT) If Your Score Falls Short

This is the step everyone forgets. If your existing line score is below the target MOS minimum, you are not stuck. You retest.

The active-duty retake is called the AFCT (Armed Forces Classification Test). It is the same ASVAB content you took to enlist, and the new scores replace your old ones for qualification purposes. If you need a higher GT specifically, the Army runs BSEP, a free score-improvement program built around the GT composite.

Do not walk in cold. Take a practice test first to find which subtests are dragging your composite down, then study those.

Start with the AFCT prep tools that target your gap: a free practice test to baseline, then BSEP for GT or self-study for other lines. Full retake rules and waiting periods are in our AFCT guide.

When your retest clears the MOS minimum, the score gate is behind you and the paperwork begins.

Step 5: Submit the Reclass Action (DA Form 4187 or Reenlistment)

The paperwork trips people up because there is no single form for everyone. The path you are on decides what you file.

If you are reclassing at your reenlistment window, the reclass usually rides on the reenlistment contract itself. If you are doing a voluntary reclass outside that window, you submit a DA Form 4187 (Personnel Action), sometimes paired with a DA Form 1696. Plenty of soldiers have never touched a 4187 for a reclass, which is exactly why the confusion exists, the answer depends on your timing.

For special and packet MOSs, the DA Form 4187 has to be signed by your company commander or higher and certifies things like stable personal affairs, height and weight compliance, and no derogatory records.

Your counselor drives the routing. Your job is to have your records clean so the action does not bounce. Once it is approved, you need a seat.

Step 6: Get a School Date Through ATRRS

Approval is not arrival. Most reclasses send you to a school or AIT for the new MOS, and that seat is scheduled through ATRRS, the Army Training Requirements and Resources System. Seat availability, not your paperwork, often sets your real timeline.

Before booking, your counselor confirms you meet the RETAIN MINQUALS (the minimum qualifications, including your line score) and that the right ATRRS course is open. Then they reserve a class date.

That date can be weeks out or months out depending on the MOS and the school's throughput. High-demand courses fill fast.

When you have a reporting date, the move is real. The last thing to understand is what actually changes once you graduate.

Step 7: Know What Changes (Rank, Bonus, Obligation)

Before you sign, understand the deal in full. A MOS reclassification changes three things, and only one of them is what most soldiers worry about.

The bonus piece changed recently. For FY2026, the Army moved to a performance-based system called the Quality Tiered Incentive Program (QTI), which ranks soldiers within their rank-and-MOS cohort on physical fitness, technical expertise, and command assessment. Bonus amounts now follow Army requirements and individual performance instead of a flat table, and the program reached full implementation in April 2026.

That is the full Army picture. If you are not in the Army, the same idea exists under a different name.

Step 8: Other Branches – Navy Conversion and Air Force Retraining

MOS is an Army word. If you serve in another branch and landed here, you want the equivalent term, because the process exists everywhere.

The mechanics differ by branch, but the core rule does not. You still have to meet the ASVAB composite or line score for the new job, and the gaining career field has to have room. Use our score calculator to check requirements across all six branches before you start a packet.

MOS Reclassification FAQ