01 / Occupational profile
Your 1161 occupational profile
Refrigerant and solvent contact
Common occupational factor
Recovering, recycling, and charging refrigerant systems involves routine skin and inhalation contact with CFCs, HCFCs, and related solvents and lubricants.
Awkward postures and confined equipment access
Common occupational factor
Diagnosing and repairing units often requires working in cramped compartments, bent or kneeling positions, and overhead reaching around vehicles and generators.
Generator, compressor, and shop equipment noise
Common occupational factor
Diagnostic and repair work is performed around running generators, compressors, and other equipment in maintenance shops and field environments.
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.
1161s install refrigeration systems to engineering specifications, recover and recycle refrigerant gases and fluids from systems, dismantle and test malfunctioning units using electrical, mechanical, and pneumatic test equipment, and repair systems by replacing or adjusting defective parts. The work covers environmental control units, field refrigeration units, and automotive air conditioning for ground equipment, and requires EPA Section 608/609 certification for handling CFCs and HCFCs. Duties involve recurring contact with refrigerants and solvents, work in cramped or awkward positions around generators and compressors, and electrical troubleshooting with energized systems.
In FY2024, the Marine Corps announced a merger of PMOS 1142 (Engineer Equipment Electrical System Technician) and 1161 under Force Design 2030; Marines who served earlier held the separate 1161 designation and duty set described here.
Duties that may vary by assignment
- Installing field refrigeration and environmental control units
- Recovering and recycling refrigerant gases and fluids
- Diagnosing and repairing electrical and mechanical system faults
- Servicing automotive and ground-equipment air conditioning systems
- Soldering, tubing repair, and component replacement
- Operating electrical, mechanical, and pneumatic test equipment
- Maintaining EPA refrigerant-handling certification
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 · 1161 Refrigeration and Air Conditioning Technician
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.
Refrigerant and solvent contact
Records that may corroborate it
- · EPA Section 608/609 certification records
- · Evaluations describing refrigeration or HVAC maintenance duties
- · Occupational health or hazmat-program records, if enrolled
Limit: The MOS does not establish contact with any specific refrigerant or exposure level; shop, era, tasks, a current diagnosis, and a medical opinion all still matter.
Awkward postures and confined equipment access
Records that may corroborate it
- · Sick call and physical therapy entries during the assignment
- · Line-of-duty or incident reports for a documented injury
- · Evaluations describing maintenance-shop duties
Limit: Typical maintenance-shop demands do not by themselves establish that a specific joint was injured in service.
Generator, compressor, and shop equipment noise
Records that may corroborate it
- · Hearing-conservation audiograms (DD 2215/2216) and DOEHRS-HC records
- · Evaluations describing maintenance duties and equipment worked on
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.
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.
Respiratory / skin +
Respiratory or skin conditions from refrigerant and solvent contact
Why the occupation may matter: Routine refrigerant recovery and solvent use are part of the duty set.
Records and clinical evidence: Current diagnosis, duty records, and a medical opinion.
Occupational history alone does not establish this diagnosis or its medical relationship to service.
Spine / joints +
Back, shoulder, and knee conditions
Why the occupation may matter: Awkward postures and confined-space repair work load the joints repeatedly.
Records and clinical evidence: Current diagnosis, in-service treatment 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: Shop and field work is performed around running generators and compressors.
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.
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 1161 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.
Chemical exposure described too generally
Statements like "I worked with refrigerants" without the specific systems and frequency are hard for VA to evaluate; certification and shop records may add detail.
No in-service complaint on file
Repair-shop strains and skin irritation were often self-treated; evaluations and buddy statements may help fill that gap.
Hearing link rejected on separation audiogram
A normal separation audiogram alone does not decide a hearing claim, but examiners often rely on it without addressing the full noise 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.
1161 questions
Does my 1161 MOS prove which refrigerants I handled?
No. It shows the occupational field. EPA certification records and unit maintenance records are the usual sources for the specific systems and products.
I heard 1161 merged with another MOS. Does that affect an older claim?
No. The FY2024 merger of 1142 and 1161 changed how the job is organized going forward; it does not change the duties documented during a Marine's own period of service.
Is refrigerant exposure itself a disability?
No. Exposure is an event, not a disability. A current diagnosed condition and a medical link to service are still required.
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.