01 / Occupational profile
Your 0621 occupational profile
Heavy load carriage
Common occupational factor
Radios, spare batteries, and antennas add significant weight to a standard combat load on marches and patrols.
Weapons and range noise with attached units
Common occupational factor
Operators attached to infantry units share range and combat noise environments; the MOS itself is not noise-hazardous, but the attachment may be.
Static positions and repetitive keying
Common occupational factor
Long radio watches involve sustained sitting or kneeling in field positions and repetitive hand use.
Events experienced with attached units
Assignment-dependent
Operators attached to combat units may have been present for the same firefights, IED strikes, and casualties as the unit they supported.
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.
0621s set up, operate, and maintain tactical radio equipment, erect antennas, run communications checks, and keep traffic flowing for their unit. In the field, the radio and batteries add substantial weight to an already heavy pack, and antenna erection involves climbing and awkward positions. Operators attached to infantry or reconnaissance units share those units' marches, patrols, and field conditions; those in communications companies or headquarters have a different profile. Assignment records and evaluations are what separate the two.
Radio sets changed across eras — from PRC-77 to PRC-119 and beyond — but the load carriage, antenna work, and field attachment profile stayed consistent. The unit a radio operator was attached to matters more than the code.
Duties that may vary by assignment
- Carrying radios and batteries in addition to a full combat load
- Erecting and maintaining antennas, often aloft or in awkward positions
- Operating and troubleshooting tactical radio equipment
- Foot patrols and field exercises with attached units
- Long static watch at radio positions
- Field and deployed operations in all weather
Related historical codes: Legacy 2531 Field Radio Operator; 0629 Radio Chief duties at senior levels
Private, on this page only
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 · 0621 Field Radio Operator
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
Already have a VA decision?
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.
Heavy load carriage
Records that may corroborate it
- · Assignment records showing attachment to an infantry or operational unit
- · Evaluations describing field radio duties
- · Sick call entries for back, knee, or foot complaints
Limit: Load carriage alone does not establish that a current joint condition is related to service; a current diagnosis and medical opinion are required.
Weapons and range noise with attached units
Records that may corroborate it
- · Hearing-conservation audiograms (DD 2215/2216) and DOEHRS-HC records
- · Assignment records identifying the attached unit
- · Unit training or operations records
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.
Static positions and repetitive keying
Records that may corroborate it
- · Evaluations describing watch and communications duties
- · Sick call entries during field exercises or deployments
Limit: Typical communications demands do not by themselves establish a specific injury or its relationship to service.
Events experienced with attached units
Records that may corroborate it
- · Unit command chronologies and operational records
- · Combat action ribbon or other award citations
- · Statements from members of the attached unit
Limit: A documented 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 +
Back, knee, and foot conditions
Why the occupation may matter: Radio weight on top of a combat load adds to march and patrol strain.
Records and clinical evidence: Current diagnosis, attachment and 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: Attachment to infantry units can mean shared weapons and blast noise.
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 from events with attached units
Why the occupation may matter: Operators were present for what their unit experienced.
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.
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 0621 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.
Claim evaluated as a desk job
A 0621 attached to an infantry unit has a completely different profile than one in a comm shop; assignment records are what show which one you were.
Stressor not in individual records
Events involving the attached unit appear in that unit's records, not necessarily yours; command chronologies and buddy statements may corroborate them.
Injuries treated in the field
Field injuries were often self-treated; buddy statements and duty records may fill part of that gap.
Oakridge Claims / Appeals only
Already have a VA decision?
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 handles post-decision appeals, not initial or other new claims.
Fees for eligible post-decision representation are governed by a written agreement. See fee details. No outcome is guaranteed.
0621 questions
Does my 0621 MOS show I was in the field?
Not by itself. Field radio operators served everywhere from infantry line companies to headquarters. Your assignment records and evaluations show which kind of unit you supported.
How do I show what my attached unit did?
Unit command chronologies, available through the National Archives and Marine Corps History Division, document a unit's operations during a period.
My back problems started from humping a radio, but I never went to medical. Now what?
Duty and attachment records, plus statements from Marines you served with, may help document the load and duties, though none of them guarantees an outcome.
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.