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Presumptive Service Connection Study Guide for the VA Claims Agent Exam: 38 CFR 3.307 and 3.309

Normally, service connection requires three things: a current disability, an in-service event, and a nexus linking them. Presumptive service connection throws out the third requirement. When the law applies, VA assumes the disease is connected to service, and the veteran never has to prove the link. This guide walks through the whole presumptive framework the way the claims agent exam tests it: the statute, the two regulations, chronicity and continuity of symptomatology, Agent Orange, and the PACT Act additions that reshaped the landscape in 2022.

What "presumptive" means in VA law

The statutory backbone is 38 U.S.C. 1112, which creates presumptions for chronic diseases, tropical diseases, former prisoners of war, and veterans exposed to radiation or herbicide agents. Congress enacted these presumptions because proving individual causation was practically impossible for whole classes of veterans: nobody can show which specific burn pit smoke particle caused their asthma, or which spray mission caused their diabetes. Rather than make every veteran fight that unwinnable battle, the law shifts the burden. Once the veteran proves qualifying service and a listed disease within the presumptive period, service connection follows as a matter of law.

The exam tests whether you understand that bargain. A presumptive claim still requires evidence, but the evidence is about service and diagnosis, not causation. The two regulations divide the work cleanly. Section 3.307 answers "under what conditions does a presumption apply," and section 3.309 answers "which diseases are covered." Candidates who memorize only the disease lists without learning the gate conditions in 3.307 lose easy points, because the exam scenarios almost always turn on whether the service qualifies or the timing fits.

The chronicity route: 3.307(a)(3) and 3.303(b)

The most broadly useful presumption has nothing to do with toxic exposure. Under 38 CFR 3.307(a)(3), a chronic disease listed in 3.309(a) that becomes manifest to a degree of 10 percent or more within one year after discharge is presumed to have been incurred in service. The one-year window is the key number. A veteran discharged in June 2020 whose arthritis manifests to a compensable degree in March 2021 gets the presumption. The same arthritis manifesting in 2024 does not, at least not through this route.

That is where 38 CFR 3.303(b), continuity of symptomatology, rescues the claim. If a chronic disease was shown as such in service or within the presumptive period, later manifestations of the same disease at any later date, however remote, can be service connected, unless clearly attributable to an intercurrent cause. The veteran proves this with evidence that the symptoms continued from service to the present: lay statements, sick-call records, pharmacy records, anything showing the thread was never broken.

Agent Orange presumptives

For Vietnam-era veterans, 38 CFR 3.307(a)(6) creates a presumption of herbicide exposure for service in Vietnam, and 38 CFR 3.309(e) lists the diseases presumed connected. The classic list includes chloracne, Type 2 diabetes, Hodgkin disease, ischemic heart disease, multiple myeloma, non-Hodgkin lymphoma, Parkinson disease, porphyria cutanea tarda, prostate cancer, respiratory cancers, soft tissue sarcomas, AL amyloidosis, and early-onset peripheral neuropathy. Most of these have no time limit: they can manifest decades later and still qualify. Three are different: chloracne, porphyria cutanea tarda, and early-onset peripheral neuropathy must appear within one year of the last herbicide exposure, a timing trap the exam uses constantly.

The location presumption matters as much as the disease list. Beyond service in Vietnam itself, the presumption covers veterans who served on the inland waterways and offshore within 12 nautical miles under the Blue Water Navy law, at U.S. or Royal Thai bases in Thailand, in Laos or Cambodia, in Guam, American Samoa, or Johnston Atoll during the relevant periods, in or near the Korean demilitarized zone between 1968 and 1971, and aircrew who flew C-123 aircraft used to spray herbicides. On the exam, the location question usually hides in one sentence of the fact pattern, so read service histories carefully.

PACT Act additions: burn pits, Gulf War, and radiation

The Sergeant First Class Heath Robinson Honoring our Promise to Address Comprehensive Toxics Act of 2022, the PACT Act, is the largest expansion of presumptive benefits in VA history, and the exam now tests it heavily. For Gulf War era veterans with qualifying service, it created presumptions for more than 20 conditions tied to burn pits and other airborne hazards: brain cancer including glioblastoma, kidney cancer, melanoma, respiratory cancers of the lung, larynx, trachea, and bronchus, bladder cancer, head and neck cancers, asthma diagnosed after service, chronic bronchitis, COPD, chronic rhinitis, chronic sinusitis, constrictive bronchiolitis, emphysema, granulomatous disease, interstitial lung disease, pleuritis, pulmonary fibrosis, and sarcoidosis. Several of these, like kidney cancer and melanoma, were added after the original 2022 law, which is why agents must check the current regulation rather than relying on memory.

The PACT Act also expanded the Agent Orange side. It added hypertension and monoclonal gammopathy of undetermined significance (MGUS) to the 3.309(e) herbicide disease list, and it widened the exposure locations to include Thailand at any U.S. or Royal Thai base, Laos, Cambodia, Guam, American Samoa, and Johnston Atoll. On radiation, it expanded who counts as a radiation-exposed veteran under 38 CFR 3.311 and added presumptive conditions for veterans exposed at additional sites. For Gulf War illness under 3.317, chronic fatigue syndrome, fibromyalgia, irritable bowel syndrome, and undiagnosed illnesses remain presumptive when they are chronic, meaning present for at least six months.

How the exam tests presumptives

Presumptive questions on the claims agent exam follow a recognizable pattern. The fact pattern hands you a veteran with a service history, a diagnosis, and a timeline, then asks whether service connection is warranted and under what theory. The correct answer almost always requires two moves: first, check whether a presumption fits, and only if none fits, fall back to direct service connection with a nexus.

Train yourself to spot the four exam favorites. First, the chronicity window: arthritis diagnosed fourteen months after discharge is not presumptive under 3.307(a)(3), but check continuity of symptomatology before you rule it out. Second, the Agent Orange timing trap: chloracne appearing two years after the last exposure fails the one-year rule in 3.309(e), while prostate cancer appearing twenty years later is fine. Third, the PACT Act additions: hypertension as an Agent Orange presumptive and brain cancer as a burn pit presumptive are recent enough that older study materials miss them. Fourth, the Gulf War six-month rule: fibromyalgia or an undiagnosed illness must be chronic, meaning present for at least six months, to qualify under 3.317. In practice, the agent who masters presumptives wins cases faster and cheaper, because every presumptive grant is a grant that needed no paid nexus opinion and no battle over causation.

Sources

• 38 U.S.C. 1112, presumptions relating to certain diseases and disabilities. Full text: Cornell LII, 38 U.S.C. 1112.
• 38 CFR 3.307, presumptive service connection for chronic, tropical, or prisoner-of-war related disease, disease associated with certain herbicide agents, or disease associated with Gulf War service. Full text: eCFR 3.307.
• 38 CFR 3.309, disease subject to presumptive service connection. Full text: eCFR 3.309.
• 38 CFR 3.303(b), principles relating to service connection, chronicity and continuity. Full text: eCFR 3.303.
• 38 CFR 3.311, claims based on exposure to ionizing radiation. Full text: eCFR 3.311.
• VA PACT Act information for veterans: va.gov, The PACT Act and your VA benefits.

This page is for general information only, not legal advice. It is an independent study resource, not affiliated with or endorsed by the U.S. Department of Veterans Affairs.