Military Exposure Library
Military Toxic Exposure, Presumptive Conditions & VA Evidence Guide
now Where You Served. Understand What You Encountered. Follow the Evidence.
A physician-led guide to burn pits, Agent Orange, Gulf War hazards, contaminated water, radiation, occupational exposures, presumptive conditions, direct service connection, and the records that may matter.
Military service can involve hazards that are obvious at the time of exposure and others that may not become medically significant until years later.
Veterans may encounter chemical, physical, occupational, and environmental hazards through deployments, training, military duties, contaminated installations, industrial work, airborne pollutants, weapons systems, fuels, solvents, radiation, warfare agents, and other conditions of service.
The Military Exposure Library was created to help Veterans understand what an exposure is, how it may be documented, which health conditions may qualify for a presumption, and when an individualized medical analysis may still be necessary.
VA recognizes that service members may encounter a wide range of chemical, physical, occupational, and environmental hazards, including airborne pollutants, radiation, chemicals, contaminated water, asbestos, lead, and warfare agents.
The presence of an exposure does not automatically establish that a current medical condition was caused by that exposure. Likewise, the absence of a condition from a presumptive list does not necessarily end the inquiry.
A responsible review separates four distinct questions:
1. Where, when, and under what circumstances did the Veteran serve?
2. What substance, hazard, event, or environmental condition may have been encountered?
3. What current diagnosis, chronic residual, or medically identifiable condition exists?
4. Does the applicable law create a presumption, or must the relationship be established through individualized medical and factual evidence?
For certain combinations of qualifying service and diagnosed conditions, VA may presume that the condition is connected to military service.
When a Veteran meets the service and medical requirements for a presumption, the Veteran generally does not need to prove the individual causal relationship between the exposure and the condition. The Veteran must still establish that the qualifying service occurred and that the claimed condition has been properly diagnosed and documented.
Exposure-related evidence may come from many places. No single document is always available, and the relevant records will depend on the exposure and the Veteran’s service.
Potentially useful documentation may include:
• DD Form 214 and separation records
• Personnel and assignment records
• Deployment orders and travel records
• Military occupational specialty or rating
• Unit, ship, aircraft, installation, or duty-location records
• Performance evaluations describing actual duties
• Service treatment records
• Incident, safety, spill, fire, or contamination reports
• Exposure-monitoring or industrial-hygiene records
• VA and private medical records
• Diagnostic testing, imaging, laboratory, and pathology reports
• Surgical and hospitalization records
• Medication and treatment history
• Statements from fellow service members, supervisors, spouses, or family
• Photographs, letters, journals, or other contemporaneous material
• Records identifying post-service occupational or environmental exposures
For an original disability claim, VA generally looks for evidence of a current disability, an event, injury, disease, or exposure during service, and a relationship between the current condition and service. Medical records and medical opinions often support the relationship, while competent lay evidence may help establish observable events, symptoms, and history.
A lay or witness statement may help explain where the Veteran served, what duties were performed, what was seen or smelled, whether protective equipment was available, how often the exposure occurred, and when symptoms were first observed.
A witness should describe personal observations rather than diagnose a disease or speculate about medical causation.
A permits Veterans and other witnesses to submit lay evidence, including a Lay or Witness Statement, commonly called a buddy statement.
Toxic-exposure screenings and registry evaluations
Veterans concerned about military environmental exposures should also understand the difference among a toxic-exposure screening, an environmental health registry evaluation, a disability-compensation examination, and a private medical opinion.
A toxic-exposure screening is intended to identify possible military exposures and connect an enrolled Veteran with appropriate health care or additional resources.
An environmental health registry evaluation is a voluntary medical assessment for eligible Veterans with certain exposure histories. It can help identify health concerns and contribute to VA’s understanding of exposure-related health patterns.
Neither process automatically establishes service connection or guarantees disability compensation.
Veterans enrolled in VA health care can receive a toxic-exposure screening, and VA states that enrolled Veterans should receive the screening at least once every five years.
VA environmental health registry evaluations are free and voluntary, but they are separate from the disability-compensation process and do not themselves confirm that a military exposure occurred.
When a nexus opinion may or may not be needed
A separately purchased nexus medical opinion may not be necessary when the Veteran clearly meets the requirements for a qualifying presumptive condition and the remaining evidence is complete.
An individualized medical opinion may be more relevant when:
• The claimed condition is not presumptive
• The location or period of service falls outside the presumptive rules
• The exposure itself is disputed or incompletely documented
• The condition has multiple possible causes
• The diagnosis occurred many years after service
• The Veteran has significant post-service risk factors
• VA obtained an unfavorable medical opinion
• The question involves secondary causation or aggravation
• The medical chronology requires a detailed explanation
VNI suggested library categories:
Burn Pits & Airborne Hazards
Agent Orange & Herbicide Exposure
Gulf War Service & Chronic Multisymptom Illness
Camp Lejeune Contaminated Water
Ionizing Radiation & Depleted Uranium
Mustard Gas, Lewisite & Warfare Agents
Asbestos, Lead & Occupational Hazards
Fuels, Solvents & Industrial Chemicals
Oil-Well Fires, Sulfur Fires & Particulate Matter
Aviation, Exhaust & Mechanical Fumes
Noise, Blast & Repetitive Vibration
Project 112, SHAD & Chemical Testing
Toxic Embedded Fragments
Vaccinations, Medications & Treatment-Related Questions
Toxic-Exposure Screening & VA Registries
Presumptive Conditions
Direct Exposure Claims
Exposure Evidence & Witness Statements
Agent Orange & Herbicide Exposure
Gulf War Service & Chronic Multisymptom Illness
Camp Lejeune Contaminated Water
Ionizing Radiation & Depleted Uranium
Mustard Gas, Lewisite & Warfare Agents
Asbestos, Lead & Occupational Hazards
Fuels, Solvents & Industrial Chemicals
Oil-Well Fires, Sulfur Fires & Particulate Matter
Aviation, Exhaust & Mechanical Fumes
Noise, Blast & Repetitive Vibration
Project 112, SHAD & Chemical Testing
Toxic Embedded Fragments
Vaccinations, Medications & Treatment-Related Questions
Toxic-Exposure Screening & VA Registries
Presumptive Conditions
Direct Exposure Claims
Exposure Evidence & Witness Statements
VA organizes military exposures across categories that include chemicals, radiation, air pollutants, occupational hazards, warfare agents, wars and operations, and condition-specific health concerns.
This library is educational and does not diagnose a condition, confirm that an exposure occurred, establish service connection, or predict a VA decision.
Presumptive conditions, qualifying locations, eligibility periods, forms, and VA procedures may change. Veterans should verify current requirements through VA and consult a VA-accredited representative for individual claims guidance.
An exposure history deserves more than assumption. It deserves accurate service records, careful medical evaluation, current law, and an honest assessment of what the evidence can support.
