01 / Occupational profile
Your 0321 occupational profile
Parachute landings and heavy load-bearing
Common occupational factor
Repeated static-line and free-fall parachute landings, and long movements under rucksacks exceeding typical infantry loads, place sustained stress on the spine, hips, knees, and ankles.
Cold-water immersion and dive exposure
Common occupational factor
Combatant diving and small-boat insertions involve sustained cold-water immersion, which is a recognized factor in some musculoskeletal and neurological complaints.
Weapons, demolitions, and aircraft noise
Common occupational factor
Training and operations expose recon Marines to small-arms fire, demolitions, and rotary- and fixed-wing aircraft noise during insertion and extraction.
Sustained operational stress and direct action
Assignment-dependent
Long isolated surveillance postures, sleep deprivation, and limited-objective raids or direct-action missions are part of the recon tasking profile.
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.
0321s train and operate in small teams to conduct reconnaissance, surveillance, and limited-objective raids, inserting by foot, parachute, small boat, or combatant dive. Training and operational tasking include long-range movement under heavy loads, extended static observation positions in exposed terrain, military free-fall and static-line parachute operations, combatant diving, demolitions, and calling for supporting arms. The physical demands are cumulative: repeated parachute landing falls, cold-water dive exposure, sustained load-bearing marches, and sleep-deprived surveillance postures are part of the training pipeline and operational tempo, not isolated events. Deployed tasking adds direct-action and special reconnaissance missions with their own risk profile.
Recon units and tasking have shifted across eras — from battalion recon platoons to Force Recon companies and MARSOC-adjacent missions — and diving, parachute, and mountain workloads varied with unit and billet. The unit and course record matter more than the code alone.
Duties that may vary by assignment
- Long-range foot patrols and movement under heavy rucksack loads
- Extended static surveillance and observation in concealed positions
- Military free-fall and static-line parachute insertions
- Combatant diving and small-boat insertion operations
- Demolitions and limited direct-action tasking
- Calling for and adjusting supporting arms fire
- Mountain, cold-weather, and amphibious training evolutions
Related historical codes: 0323 Reconnaissance Marine, Parachute Qualified, where duties overlap; 0324 Reconnaissance Marine, Combatant Diver Qualified, where duties overlap
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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
Marine Corps · 0321 Reconnaissance Marine
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.
Parachute landings and heavy load-bearing
Records that may corroborate it
- · Jump logs and parachutist qualification records
- · Sick call and orthopedic entries during recon assignments
- · Line-of-duty or incident reports for a documented landing or jump injury
- · Evaluations and fitness reports describing recon duties
Limit: The MOS does not by itself establish that a specific joint injury occurred on a specific jump or patrol; a current diagnosis, duty records, and a medical opinion are still required.
Cold-water immersion and dive exposure
Records that may corroborate it
- · Dive logs and combatant diver qualification records
- · Sick call entries for cold or dive-related complaints
- · Evaluations describing dive-qualified duties
Limit: Dive training and operations alone do not establish a specific current diagnosis; clinical findings and a medical opinion are required.
Weapons, demolitions, and aircraft noise
Records that may corroborate it
- · Hearing-conservation audiograms (DD 2215/2216) and DOEHRS-HC records
- · Range and demolitions qualification records
- · Evaluations describing training and operational tasking
Limit: Documented noise supports the in-service event only. A current hearing disability under 38 CFR § 3.385 or a tinnitus complaint, and a medical link, are still required.
Sustained operational stress and direct action
Records that may corroborate it
- · Unit command chronologies and operational records
- · Award citations and after-action reports
- · Statements from Marines in the same team
Limit: A documented operational tempo or event is one element. A current diagnosis and a medical opinion linking it are still required.
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.
Spine / joints +
Lumbar spine, hip, knee, and ankle conditions
Why the occupation may matter: Repeated parachute landings and sustained heavy load-bearing are recognized joint stressors in the recon training and operational pipeline.
Records and clinical evidence: Current diagnosis, jump logs or duty records, and a medical opinion.
Occupational history alone does not establish this diagnosis or its medical relationship to service.
Hearing +
Tinnitus and hearing loss
Why the occupation may matter: Weapons, demolitions, and aircraft noise are part of recon training and operations.
Records and clinical evidence: Audiometry meeting 38 CFR § 3.385, service audiograms, and a medical opinion.
Occupational history alone does not establish this diagnosis or its medical relationship to service.
Mental health +
PTSD and other conditions from operational tempo
Why the occupation may matter: Direct-action missions, isolated surveillance, and sustained operational stress are part of the tasking.
Records and clinical evidence: Current diagnosis, corroborated stressor, and a medical opinion.
Occupational history alone does not establish this diagnosis or its medical relationship to service.
Brain / head +
TBI from blast or impact exposure
Why the occupation may matter: Demolitions training and parachute or dive mishaps carry head-impact and blast-exposure potential.
Records and clinical evidence: Documented incident, current diagnosis, 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 0321 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.
Joint injury attributed to 'normal wear'
Repeated parachute landings and heavy rucking accumulate over a career; jump logs and sick call entries may help document the pattern rather than a single event.
Stressor not independently verified
Reconnaissance missions are often compartmented or lightly documented at the individual level; unit command chronologies and award citations may corroborate them.
Cold-water dive complaints dismissed as unrelated
Musculoskeletal or neurological complaints following cold-water immersion may be evaluated without full consideration of the dive history; dive logs may help establish that history.
Oakridge Claims / Appeals Focused
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The important question is what VA accepted, what it rejected, and why. A decision review considers the decision, examinations, and the complete record — including private and VA records that may need development. Oakridge is appeals-focused — core work is post-decision, but initial and new claims are accepted on a case-by-case basis (no fee for pre-decision work).
Fees for eligible post-decision representation are governed by a written agreement. See fee details. No outcome is guaranteed.
0321 questions
Does my 0321 MOS prove I made a specific number of jumps or dives?
No. It shows the occupational field. Jump and dive logbooks, if retained, are the usual records for the specific count and dates.
I never reported a landing injury at the time. Is there anything to look for?
Possibly. Jump logs, evaluations, and statements from team members may help document the duty history, though none of them guarantees an outcome.
Does serving in recon establish a PTSD stressor automatically?
No. A stressor still needs to be documented or otherwise corroborated, a current diagnosis is required, and a medical opinion connects the two.
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.