Burn Pit Exposure Claims: How to Prove Service Connection

What Burn Pits Were — and What They Did to Veteran Health

Open burn pits were used at virtually every major U.S. military installation in Iraq, Afghanistan, and other post-9/11 theater locations. At their peak, Balad Air Base in Iraq operated a burn pit covering nearly 10 acres — burning up to 200 tons of waste every day. Similar pits operated at Kandahar Airfield, Bagram Airfield, and dozens of forward operating bases across the theater.

These pits burned everything military operations produce: ammunition and unexploded ordnance, medical and human waste, petroleum products and hydraulic fluids, metals, plastics, rubber, chemicals, paints, and electronics. The combustion produced a toxic aerosol cocktail that veterans breathed constantly, often for months or years at a stretch.

Documented Health Effects of Burn Pit Exposure

Research by the VA, Department of Defense, and academic institutions has documented a range of health conditions linked to burn pit smoke exposure:

• Respiratory conditions: Constrictive bronchiolitis (a rare, irreversible lung disease), obliterative bronchiolitis, reactive airway dysfunction syndrome (RADS), chronic bronchitis, asthma onset, and reduced pulmonary function that does not match typical smoking-related COPD patterns
• Rare cancers: Glioblastoma (brain cancer), lymphomas, leukemia, and a range of solid-organ cancers at rates disproportionate to age-matched civilian populations
• Neurological conditions: Headaches, cognitive difficulties, and in some cases, early-onset neurodegenerative symptoms
• Cardiovascular effects: Documented cardiac dysfunction in veterans with no other cardiac risk factors
• Reproductive and endocrine effects: Thyroid disorders and reproductive system cancers at elevated rates

The PACT Act Solution: Presumed Exposure

Before August 2022, a veteran with lung cancer who served at Bagram Airfield had to prove — through medical and scientific evidence — that their specific cancer was caused by their specific exposure at that base. This was an essentially impossible standard given the complexity of cancer etiology and the limitations of medical record-keeping in combat zones.

The PACT Act (Public Law 117-168) changed this system in two fundamental ways:

1. Presumed exposure: If you served in a covered location during a covered time period, VA now presumes you were exposed to airborne hazards including burn pit smoke. You don't need to document individual exposure incidents.
2. Presumed service connection (for listed conditions): If you have a current diagnosis of one of the 38 listed cancers or other qualifying conditions, and you have presumed exposure, VA must presume your condition is service-connected — unless there is clear and unmistakable evidence that it pre-existed service and was not aggravated by service.

The legal authority for this presumption system is 38 C.F.R. § 3.309(f), as amended by the PACT Act. The burden of proof has effectively shifted from the veteran to the government.

Covered Locations and Time Periods

Burn pit exposure is presumed for veterans who served in the following locations during the applicable time periods. Note that service in some locations qualifies under both the Gulf War (post-August 2, 1990) and post-9/11 frameworks:

Locations per 38 C.F.R. § 3.317 (Gulf War) and PACT Act § 3111–3117 expansions; additional locations may be added by VA rulemaking.

The Burn Pit Registry: Why You Should Enroll

The VA Airborne Hazards and Open Burn Pit Registry (commonly called the "Burn Pit Registry") is a voluntary database that veterans can join to document their exposure history. You can enroll at va.gov.

Registry enrollment does not, by itself, establish service connection or guarantee a benefit award. However, it serves several important functions for your VA claim:

• Documentation of exposure: Your registry entry creates an official VA record acknowledging that you reported burn pit exposure. This can strengthen your claim file.
• Medical evaluation access: Enrolled veterans are offered a free airborne hazards health evaluation at a VA medical center, which creates a medical record of your current health status and any exposure-related findings.
• Claim corroboration: VA raters and C&P examiners can reference your registry enrollment as supporting evidence of exposure history in your covered location.
• Research contribution: Registry data informs ongoing VA research into long-term health effects, potentially expanding future presumptive lists.

Presumptive Conditions for Burn Pit Veterans

Under the PACT Act, veterans with qualifying burn pit exposure history and a current diagnosis of the following conditions are presumptively service-connected:

The 38 Presumptive Cancers (38 C.F.R. § 3.309(f)(2))

All 38 cancers on the PACT Act list apply to qualifying burn pit/airborne hazard veterans — including all head and neck cancers, gastrointestinal cancers, respiratory cancers, reproductive system cancers, bladder cancer, kidney cancer, melanoma, thyroid cancer, glioblastoma, and hematopoietic (blood) cancers. See our complete PACT Act cancer list at PACT Act Explained: Every New Presumptive Condition Added in 2022.

Constrictive Bronchiolitis and Obliterative Bronchiolitis

These rare and serious lung diseases are specifically associated with burn pit and airborne hazard exposure and are distinct from standard COPD or emphysema. Constrictive (or obliterative) bronchiolitis involves scarring and narrowing of the smallest airways in the lungs, causing airflow obstruction that does not respond to bronchodilators.

These conditions are particularly significant because:

• They are rare in the general population but documented at elevated rates in post-9/11 veterans
• Standard pulmonary function tests (spirometry) often appear normal even in affected veterans — the diagnosis typically requires surgical lung biopsy or specialized CT imaging
• VA recognizes these conditions as distinct from COPD and rates them under Diagnostic Code 6600 (bronchitis, chronic) or 6825 (diffuse interstitial fibrosis) depending on findings

Non-Presumptive Conditions: You Can Still File

The PACT Act's presumptive list is not exhaustive. If you have a condition you believe is related to burn pit or toxic exposure that is not on the presumptive list — including certain autoimmune conditions, neurological disorders, and other cancers not yet listed — you can still file a claim for direct service connection.

For non-presumptive conditions, you will need:

• Evidence of a current diagnosis from a physician
• Evidence of exposure (your service in a covered location, plus any additional exposure documentation)
• A nexus letter — a medical opinion from a specialist (ideally a pulmonologist, oncologist, or the relevant specialist) stating that it is "at least as likely as not" that your condition is related to your in-service toxic exposure

The "at least as likely as not" standard (50% probability) is the legal threshold under 38 C.F.R. § 3.102. VA is required to resolve reasonable doubt in the veteran's favor.

Evidence to Gather Before You File

Strong burn pit claims are built on a specific evidentiary foundation. Gather these documents before or simultaneously with filing:

How the C&P Exam Works for Burn Pit Claims

After you file, VA will schedule a Compensation and Pension (C&P) examination to evaluate your claimed condition(s). For burn pit claims, here is what the examiner is assessing:

For Presumptive Cancer Claims

The C&P examiner's role is primarily to confirm your diagnosis and its current severity for rating purposes — not to determine service connection (which is already presumed). The examiner will:

• Review your diagnosis documentation and confirm the cancer type
• Assess current severity: remission vs. active disease, treatment side effects, functional limitations
• Assign a rating under the applicable diagnostic code — active cancers requiring systemic treatment typically receive a minimum 100% rating while treatment is ongoing

For Respiratory Conditions

C&P examiners for respiratory claims typically conduct or review:

• Pulmonary function testing (spirometry and DLCO) — VA rates lung conditions primarily on FEV1 percentage predicted and FVC
• Exercise tolerance and functional limitations
• Review of imaging (chest X-ray, CT scan) findings
• Assessment of treatment history and response

If Your Condition Isn't on the Presumptive List

If your condition is not among the 38 PACT Act cancers or specifically listed respiratory conditions, you still have a path to service connection — it just requires more work:

1. Establish exposure through your service records, location documentation, and Burn Pit Registry enrollment
2. Document your diagnosis thoroughly with specialist records
3. Obtain a private nexus letter from a specialist — this is the most important step for non-presumptive claims. The letter should explain the mechanism by which burn pit exposure could cause or contribute to your specific condition, reference relevant medical literature, and provide the physician's opinion that service connection is "at least as likely as not"
4. File with a complete package including the nexus letter, medical records, and a personal statement describing your exposure
5. Appeal if denied — C&P examiners sometimes issue inadequate opinions on non-presumptive claims. If your nexus letter is strong and VA's examiner is vague or dismissive, challenge the adequacy of the examination on appeal

2025 Tip: File Now, Even If Symptoms Are Early

One of the most common — and costly — mistakes burn pit veterans make is waiting until their condition is "bad enough" to file. Under VA's effective date rules (38 C.F.R. § 3.400), your back pay runs from the date VA receives your claim, not from the date your symptoms got worse.

If you served in a covered location and have been diagnosed with any respiratory condition or cancer — even if it's currently in remission or being treated — file your claim now. Even a 10% rating for a service-connected condition:

• Pays $175.51/month in 2025 (single veteran, no dependents)
• Qualifies you for VA healthcare at no cost for your service-connected condition
• Establishes your claim date for future rating increases if your condition worsens
• Potentially qualifies you for other benefits (commissary access at 10%, dental at 100%, etc.)