VA Disability by MOS: Noise, PTSD, and Toxic Exposure

Your Military Occupational Specialty does not by itself entitle you to VA disability compensation, but it often decides whether the VA accepts that an in-service event happened. In VA disability claims, your MOS works as circumstantial evidence: raters use your job code and duty assignments to infer noise exposure, combat participation, or contact with hazards when the service treatment records don’t spell those things out. Whether that inference gets made — and how strongly — depends on the type of claim.

What MOS Actually Does in a Claim

A service-connected disability claim generally requires three things: a current diagnosis, an in-service event or exposure, and a medical opinion linking the two. The DD214 and service treatment records are the primary documents a rater reviews, but those records rarely capture every relevant event. MOS fills part of that gap. It suggests what a veteran was likely exposed to or experienced, even when specific incidents went undocumented.

The VA’s data systems do not directly attribute a veteran’s specific disabilities to their MOS or deployment periods.¹ MOS is one piece of evidence raters weigh alongside medical records, service history, and lay statements. Where it carries the most weight is in three areas: hearing claims, PTSD stressors, and a narrow slice of toxic exposure cases.

Hearing Loss and Tinnitus: The Duty MOS Noise Exposure Listing

Hearing claims are where MOS most clearly drives a decision. Tinnitus and hearing loss are the two most common service-connected disabilities, affecting more than 3.5 million and 1.6 million veterans respectively as of fiscal year 2025.¹

In September 2010, the VA issued Fast Letter 10-35 and introduced the Duty MOS Noise Exposure Listing. It is a Department of Defense-verified list that sorts military occupational specialties into three probability bands for hazardous noise exposure: Highly Probable, Moderate, or Low.²

The listing changes how raters handle hearing claims in a concrete way. If your MOS falls under Highly Probable or Moderate, the VA concedes hazardous noise exposure without requiring a documented incident in your service treatment records. Once exposure is conceded, the VA is obligated to order a medical examination and nexus opinion on whether your current hearing loss or tinnitus is connected to that exposure. The rater must also tell the examiner the specific probability level so it can be factored into the medical opinion.²

Infantry, artillery, and armor crew MOSs typically fall under Highly Probable. Administrative and finance roles usually land in Low. If your MOS is rated Low, the listing won’t get you an automatic concession, but you can still establish noise exposure through service treatment records, buddy statements, or other evidence.

Combat MOS and PTSD Stressor Verification

PTSD is the fifth most prevalent service-connected disability, with more than 1.76 million veterans receiving compensation for it.¹ For PTSD claims, proving the stressor — the traumatic event itself — is usually the hardest part, and MOS can shorten that fight.

Under 38 CFR 3.304(f)(2), if evidence establishes that a veteran engaged in combat with the enemy and the claimed stressor relates to that combat, the veteran’s own testimony is enough to establish the stressor, as long as it is consistent with the circumstances of service.³ A combat MOS such as infantryman (11B) or combat engineer (12B) is strong evidence of combat engagement, which is why claims with those job codes tend to move faster.

A 2010 rule change extended similar relief to veterans without a combat MOS. Under 38 CFR 3.304(f)(3), if a PTSD stressor is related to fear of hostile military or terrorist activity, lay testimony alone can establish it, provided a VA psychiatrist or psychologist confirms the stressor is adequate to support the diagnosis and it is consistent with the places and circumstances of your service. The VA has clarified that MOS “may be considered as evidence of exposure to a stressor” but does not by itself establish exposure.⁴ VA adjudicators, not medical examiners, decide whether a claimed stressor is consistent with the veteran’s service history.

Toxic Exposure: Where Deployment Beats Job Title

For toxic exposure claims — burn pits, Agent Orange, contaminated water, radiation — the VA generally looks at where and when you served, not what MOS you held. The PACT Act of 2022 expanded this framework by creating presumptive conditions tied to service in specified locations during specified time periods.⁵

Under the presumptive system, veterans who served in covered locations don’t have to prove causation. Covered service currently includes:

Post-9/11 service (on or after September 11, 2001) in Afghanistan, Djibouti, Egypt, Jordan, Lebanon, Syria, Uzbekistan, Yemen, and the airspace above them.
Gulf War-era service (on or after August 2, 1990) in Bahrain, Iraq, Kuwait, Oman, Qatar, Saudi Arabia, Somalia, the UAE, and the airspace above them.⁶

The PACT Act added more than 20 presumptive conditions, including brain, gastrointestinal, kidney, lung, pancreatic, and reproductive cancers, and respiratory illnesses such as asthma diagnosed after service, COPD, chronic sinusitis, and pulmonary fibrosis.⁵ In June 2024, the VA added male breast cancer, urethral cancer, and cancer of the paraurethral glands under a framework that lets it expand the list without new legislation.⁷

There is one notable toxic-exposure presumption that does turn on job assignment. Air Force personnel who operated, maintained, or serviced C-123 aircraft used to spray herbicides during the Vietnam era qualify for Agent Orange presumptive conditions based on that duty.⁸

Toxic Exposure Risk Activity (TERA)

If your condition isn’t on the presumptive list, the PACT Act’s TERA framework may still help. When you submit evidence of a disability plus evidence of participation in a Toxic Exposure Risk Activity, the VA must order a medical examination and nexus opinion.⁹ TERA participation is conceded if you served in locations with a presumption of exposure, or if entries in your Individual Longitudinal Exposure Record (ILER) correspond to a qualifying activity.¹⁰ Active-duty personnel and reservists with a Common Access Card can currently access their ILER records; the VA is expected to open access and self-reporting to veterans in fall 2026.¹¹

Other Presumptives Tied to Service Circumstances

Several other presumptive categories turn on service circumstances rather than MOS or general causation proof:

Former prisoners of war qualify for presumptive conditions including anxiety disorders, PTSD, heart disease, stroke, osteoporosis, and frostbite residuals for any period of captivity, with additional conditions such as beriberi, chronic dysentery, peptic ulcer disease, and peripheral neuropathy for those held 30 days or longer.¹²
Veterans who served at Camp Lejeune for at least 30 days between August 1953 and December 1987 receive presumptive status for adult leukemia, bladder cancer, kidney cancer, liver cancer, multiple myeloma, non-Hodgkin’s lymphoma, and Parkinson’s disease.⁸
Atomic veterans, including those involved in atmospheric nuclear testing, the occupation of Hiroshima or Nagasaki, or cleanup at Enewetak Atoll, Palomares, and Thule Air Force Base, receive presumptive status for various cancers and lymphomas.⁸

Using Your MOS as Evidence When You File

The claim form is VA Form 21-526EZ. The core evidence package generally includes your DD214 or other separation documents, service treatment records, and medical evidence of the current condition such as doctor’s reports, imaging, and test results.¹³

Your DD214 lists your primary MOS and often notes specific assignments, deployments, and awards. The VA doesn’t ask for MOS as a separate evidence category, but raters see it in the records. You can give it more weight in a few ways.

File lay and buddy statements. VA Forms 21-10210 and 21-4138 let you and fellow service members describe in plain terms what the job actually involved: the daily noise levels, the chemicals handled, the physical demands, the combat conditions. These carry real weight with raters.¹³

Connect your MOS to a recognized exposure in the claim itself. If your job code appears on the Duty MOS Noise Exposure Listing, if your deployment location falls within a PACT Act presumptive area, or if you held a combat MOS relevant to a PTSD stressor, point that out. Making the connection explicit prompts the rater to concede the in-service event and order the medical examination.

For presumptive conditions, focus your evidence on qualifying service and current diagnosis. You need military records confirming the qualifying service and medical records showing the diagnosis and its severity. No individual nexus evidence is required.¹³ If a previous denial predates a newly added presumptive — many were added by the PACT Act — you can file a Supplemental Claim for a fresh review.

1
VA Benefits Administration. 2025 Annual Benefits Report – Compensation
2
U.S. Department of Veterans Affairs. Board of Veterans Appeals Decision, Citation Nr. 1225109
3
eCFR. 38 CFR § 3.304 – Direct Service Connection
4
Federal Register. Stressor Determinations for Posttraumatic Stress Disorder
5
U.S. Department of Veterans Affairs. The PACT Act and Your VA Benefits
6
U.S. Department of Veterans Affairs. Specific Environmental Hazards
7
U.S. Senate Committee on Veterans’ Affairs. VA Expands Toxic-Exposed Veterans Eligibility for Benefits Using Tester’s PACT Act
8
U.S. Department of Veterans Affairs. Presumptive Service Connection Information
9
Office of the Law Revision Counsel. 38 U.S.C. § 1168 – Medical Nexus Examinations for Toxic Exposure Risk Activities
10
Federal Register. VA Adjudication Regulations for Disability or Death Benefit Claims Based on Toxic Exposure
11
TRICARE Newsroom. Know Your Exposure Story: Military to Provide Access to Individual Occupational Health Records
12
U.S. Department of Veterans Affairs. Presumptive Disability Benefits
13
U.S. Department of Veterans Affairs. Evidence Needed for Your Disability Claim