01 / Occupational profile
Your 13J occupational profile
Artillery, generator, and vehicle noise
Common occupational factor
Fire direction centers may operate near firing howitzers or launchers, and command posts commonly run on tactical generators. Distance from the guns, shelter type, and hearing protection vary by assignment.
Field setup and vehicle work
Common occupational factor
Moving command post equipment, raising antennas and shelters, handling generators and fuel cans, and riding in tactical vehicles can place demands on the back, knees, and shoulders.
Sustained screen and keyboard work
Common occupational factor
Long shifts at terminals and radios in cramped vehicles or shelters may be relevant context for documented neck, wrist, or eye-strain complaints.
Deployment-specific exposures
Location-dependent
Deployed fire support positions vary by location and era; burn pit, particulate, or other environmental exposures depend on documented location and dates, not the MOS.
Fire mission and counter-fire stress
Assignment-dependent
Deployed fire support and counter-fire work can involve indirect fire attacks on the position and responsibility for mission accuracy.
02 / Your service
What did you actually do?
Your MOS is the starting point. Your actual assignment, era, equipment, location, and duties determine which parts of the occupational history are relevant. Use the Evidence Builder below to select your actual duties and see records that may corroborate them.
13Js establish and operate automated fire control systems, process fire missions, maintain situational awareness of friendly units and targets, and manage digital communications between observers, fire support elements, and firing units. In the field that means setting up and tearing down command post equipment and shelters, running and refueling generators, operating from tactical vehicles for long shifts, and working overnight fire missions. Some assignments place the specialist inside a battery fire direction center positioned near howitzers or rocket launchers; others are in higher-echelon operations centers farther from the guns. Deployed tasking may include base defense fire support and counter-fire operations.
Fire direction work moved from manual computation to automated systems such as AFATDS, and the former 13D and 13P specialties were folded into 13J. Whether a soldier worked inside a battery fire direction center close to firing guns, in a battalion or brigade operations center, or in a fire support element with maneuver units changes the exposure picture considerably.
Duties that may vary by assignment
- Operating AFATDS or predecessor automated fire control systems
- Processing calls for fire and computing or verifying firing data
- Working in battery, battalion, or brigade fire direction and operations centers
- Setting up command posts, shelters, antennas, and generators
- Long shifts in tactical vehicles and field positions
- Positions near firing cannon or rocket units, depending on assignment
- Deployed counter-fire or base defense fire support where orders show it
Related historical codes: 13D Field Artillery Automated Tactical Data System Specialist (former designator, consolidated into 13J; earlier records may list 13D); 13P MLRS Operational Fire Direction Specialist (former designator, consolidated into 13J)
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Military Occupational Evidence Builder
Based on what you actually did in the military, what records might document it? Select only what applied to you. No name, file number, contact details, free text, or upload. Nothing is saved or sent.
Military service
Army · 13J Fire Control Specialist
For another specialty, open its guide from the MOS library. A job code alone does not establish individual duties or exposure.
Era(s) of service
Deployments
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Your Evidence Builder identifies records that may document your service history. If VA has already decided your claim, the next question is different: what did VA accept, what did VA reject, and why?
Request a free decision review03 / Corroboration
Building your occupational history
Records matter because they can connect a job title to an individual's actual work and circumstances.
Artillery, generator, and vehicle noise
Records that may corroborate it
- · Hearing-conservation audiograms (DD Form 2215/2216) across the service period
- · Unit and position records showing battery-level fire direction duty
- · Evaluations or awards describing live-fire exercises or deployed fire missions
Limit: Noise exposure does not establish hearing loss meeting 38 CFR § 3.385, or that tinnitus or hearing loss is related to service, without current testing and a medical opinion.
Field setup and vehicle work
Records that may corroborate it
- · Sick-call and profile entries during field or deployed assignments
- · Line-of-duty reports for a documented injury
- · NCO evaluation reports describing field duties
Limit: The MOS does not show that a specific injury occurred or that a current joint or spine condition is related to service.
Sustained screen and keyboard work
Records that may corroborate it
- · Treatment records noting onset during service
- · Duty descriptions showing shift length and workstation conditions
Limit: Computer-based duty does not diagnose a nerve or joint disorder or establish causation.
Deployment-specific exposures
Records that may corroborate it
- · Deployment orders and DD-214 remarks
- · Post-deployment health assessments
- · Individual Longitudinal Exposure Record (ILER) where available
Limit: The MOS does not establish a qualifying location or PACT Act presumption.
Fire mission and counter-fire stress
Records that may corroborate it
- · Unit records of attacks on the position
- · Awards and evaluations
- · Statements from fellow soldiers
Limit: Duty in fire support does not by itself verify a stressor or diagnose a mental health condition.
04 / Evidence standard
What your MOS can — and cannot — establish
May help document
Work performed, circumstances of service, consistency of an alleged exposure, and the nature or duration of duties where supported by individual records.
Does not automatically establish
A diagnosis, medical causation, severity, percentage, presumption, or entitlement to service connection.
05 / Medical evidence
Conditions that may be relevant to the occupational history
This is not a list of conditions to claim. A veteran's actual diagnosis and individual service record determine relevance; occupational evidence is not medical causation.
Hearing +
Tinnitus or hearing loss
Why the occupation may matter: Artillery, generator, and vehicle noise may be relevant when records show the assignment and exposure history.
Records and clinical evidence: In-service audiograms, current audiology testing, onset history, and a reasoned medical opinion; hearing loss must meet 38 CFR § 3.385.
Occupational history alone does not establish this diagnosis or its medical relationship to service.
Spine and joints +
Back, knee, or shoulder conditions
Why the occupation may matter: Equipment handling and field setup provide context for a documented in-service injury or history.
Records and clinical evidence: Service treatment and profile records, current findings, imaging where relevant, and an individualized opinion.
Occupational history alone does not establish this diagnosis or its medical relationship to service.
Neck and hands +
Neck strain or carpal tunnel complaints
Why the occupation may matter: Long terminal shifts in cramped workspaces may be relevant context only when symptoms are documented.
Records and clinical evidence: In-service treatment notes, nerve conduction testing where indicated, and a medical opinion.
Occupational history alone does not establish this diagnosis or its medical relationship to service.
Mental health +
PTSD or other mental health conditions
Why the occupation may matter: Deployed indirect fire attacks or counter-fire duty may be relevant when a stressor is documented or corroborated.
Records and clinical evidence: A current diagnosis, stressor evidence or unit records, and a medical opinion.
Occupational history alone does not establish this diagnosis or its medical relationship to service.
06 / Exposure record
ILER and toxic exposure
For applicable exposure-related claims, VA may review the Individual Longitudinal Exposure Record (ILER) and a toxic exposure risk activity (TERA) memorandum along with deployment and occupational records. An ILER entry does not automatically establish exposure or service connection.
07 / After a decision
Why a 13J claim may still be denied
An exposure finding is not the same as a grant. These are examples from the researched guide, not predictions about a particular case.
VA may accept
A duty or event consistent with the service record
But may deny
A diagnosis, medical relationship, or rating element
Record to examine
Decision findings, service and private treatment records, examination rationale, and medical opinions.
"Not near the guns" assumptions
VA may treat fire direction as low-noise office work; records showing battery-level positions can matter.
Normal separation audiogram
A normal exit test does not by itself rule out later hearing loss; VA must consider the full history and medical opinion.
Former code not recognized
A record listing 13D or 13P may be evaluated without regard to the fire direction duties those codes involved.
Oakridge Claims / Appeals Focused
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13J questions
My DD-214 says 13D. Does this guide apply?
Yes. 13D (and 13P) were former fire direction specialties consolidated into 13J. The duties described here generally overlap, but your own unit and position records control.
Is 13J considered a high-noise MOS by VA?
VA's Duty MOS Noise Exposure Listing assigns probabilities by MOS. Regardless of the listing, VA must consider your actual duties and records, such as battery-level fire direction work near firing guns.
Does being a 13J establish service connection?
No. The MOS describes duties. Service connection requires a current diagnosis, an in-service event or exposure, and a medical link between them.
Sources and legal references
General education only; not legal or medical advice. Oakridge Claims is a private business, not affiliated with or endorsed by VA. Nothing here establishes a representative-client relationship or guarantees a result. Free accredited VSO help is available.