Atomic Veteran VA Claim Guide: Hiroshima Occupation, Nevada Test Site, Enewetak & More (2026)

Who Qualifies as an Atomic Veteran

The term "atomic veteran" does not appear in 38 CFR, but VA uses it colloquially to refer to veterans who participated in what the regulations call "radiation risk activities" (RRA). The legal definition is codified in 38 CFR § 3.309(d)(3), which lists the specific activities and locations that constitute qualifying RRA exposure for presumptive service connection purposes.

VA's radiation presumptive program was established because Congress recognized that dose reconstruction for individual atomic veterans is often impossible — records were classified, dosimeters were not always worn or calibrated, and significant exposure occurred through fallout, contaminated soil, and inhalation of radioactive particles that standard film badges did not capture. Rather than requiring veterans to prove an unprovable dose, Congress established a presumptive framework: if you were there, VA presumes the exposure was sufficient to cause radiogenic disease.

Qualifying Locations and Radiation Risk Activities

Under 38 CFR § 3.309(d)(3), the following radiation risk activities qualify a veteran for atomic veteran presumptive status:

1. Hiroshima and Nagasaki Occupation (1945–1946)

Veterans who served with U.S. occupation forces in Hiroshima or Nagasaki, Japan, in the aftermath of the atomic bombings are among the most historically significant group of atomic veterans. The qualifying period is:

• Hiroshima: August 6, 1945 through July 1, 1946
• Nagasaki: August 9, 1945 through July 1, 1946

The U.S. occupation of the bombed cities began in September 1945. Tens of thousands of U.S. service members were present in the months following the bombings, walking through streets still contaminated with residual radiation, drinking water from local sources, and breathing air containing radioactive dust. The U.S. Army 41st Infantry Division, Marines, and Navy personnel were among the earliest occupation forces.

For occupation veterans, records establishing unit assignment to Hiroshima or Nagasaki during the qualifying period — including unit morning reports, service medical records showing addresses in those cities, and pay records — are the primary documentation. The National Archives and the Defense POW/MIA Accounting Agency (DPAA) maintain relevant records.

2. Atmospheric Nuclear Testing — Nevada Test Site

The Nevada Test Site (now Nevada National Security Site, NTS), located 65 miles northwest of Las Vegas, was the primary U.S. continental atmospheric test location from 1951 through 1962. Operation Upshot-Knothole (1953), Operation Teapot (1955), Operation Plumbbob (1957), and dozens of other test series were conducted here.

Service members from all branches participated in nuclear exercises — some observing from trenches less than a mile from ground zero, others participating in "maneuver" exercises that moved through test areas immediately after detonation. Radiation exposure at NTS was substantial: some exercise participants received doses far exceeding modern occupational limits, and fallout from NTS tests drifted across the western United States into Nevada, Utah, and beyond.

Qualifying NTS participants are any service members who were onsite at NTS during an atmospheric nuclear test. Records are maintained by the Defense Threat Reduction Agency (DTRA) — see the section below on obtaining DTRA records.

3. Pacific Proving Grounds — Marshall Islands and Pacific Tests

Between 1946 and 1962, the United States conducted 105 atmospheric nuclear tests in the Pacific, primarily at Bikini Atoll and Enewetak Atoll in the Marshall Islands. Operation Crossroads (1946), Operation Greenhouse (1951), Operation Ivy (including "Ivy Mike" — the first thermonuclear device, 1952), and Operation Castle (including the massive "Castle Bravo" test of March 1, 1954) were conducted in the Pacific Proving Grounds.

Castle Bravo deserves special mention. The 15-megaton explosion — far exceeding its predicted yield — spread radioactive fallout over 7,000 square miles of Pacific Ocean, contaminating the Marshall Islands and irradiating the crew of the Japanese fishing vessel Lucky Dragon. U.S. service members aboard ships in the test fleet, on nearby islands, and in aircraft conducting test support received significant radiation exposure.

Qualifying PPG participants include any service member who was on a vessel or island in the Pacific Proving Grounds area during atmospheric nuclear testing operations.

4. Enewetak Atoll Cleanup Operations (1977–1980)

Enewetak Atoll, the site of 43 U.S. nuclear tests between 1948 and 1958, underwent a massive radiological cleanup operation between 1977 and 1980. Approximately 4,000 U.S. military personnel — primarily U.S. Army and Navy engineers — spent months on Enewetak shoveling, bagging, and burying contaminated soil and debris.

The cleanup involved direct contact with radioactive materials including plutonium-239 (half-life: 24,000 years), cesium-137, and strontium-90 — without the protective equipment that would be required today. Workers moved contaminated soil by hand, ate food prepared in contaminated environments, and were often inadequately monitored for internal radiation exposure from inhaled or ingested radioactive particles.

The qualifying period for Enewetak cleanup operations is January 1, 1977 through December 31, 1980. Personnel who served on Enewetak during this period with documented duty assignment records qualify for the atomic veteran presumptive.

5. Palomares, Spain (1966)

On January 17, 1966, a B-52 bomber carrying four B28 thermonuclear weapons collided with a KC-135 tanker aircraft over Palomares, Spain. Three of the four hydrogen bombs fell on land near Palomares; the fourth fell into the Mediterranean Sea. While none detonated, two of the land-based bombs' conventional explosives detonated on impact, scattering weapons-grade plutonium across approximately one square mile of Spanish farmland.

U.S. military personnel — primarily Air Force — spent months on decontamination operations in Palomares, clearing and bagging contaminated soil. The qualifying period for Palomares is January 17, 1966 through March 31, 1967. Veterans who served at Palomares during this period are covered under 38 CFR § 3.309(d)(3).

6. Thule Air Force Base, Greenland (1968)

On January 21, 1968, a B-52 carrying four nuclear weapons crashed and burned near Thule Air Force Base in northwestern Greenland. The crash scattered weapons-grade plutonium and other radioactive materials across the sea ice. U.S. Air Force and Danish personnel spent months cleaning up the crash site in Arctic conditions, often without adequate respiratory protection.

The qualifying period for Thule is January 21, 1968 through September 25, 1968. Veterans who served at Thule during cleanup operations are covered under the atomic veteran presumptive framework.

Additional Qualifying Locations

38 CFR § 3.309(d)(3) also covers:

• Allied nuclear testing at locations including Christmas Island (Operation Dominic, UK tests) and other allied test sites where U.S. service members were present as observers or support personnel
• U.S. veterans who were prisoners of war in Japan and were present in Hiroshima or Nagasaki at the time of the atomic bombings
• Veterans who participated in the response to nuclear incidents at Johnston Island or other designated locations

Full 38 CFR § 3.309(d) Presumptive Conditions List

Under 38 CFR § 3.309(d)(2), the following radiogenic diseases are presumptively service connected for veterans with qualifying radiation risk activity service who develop them after their qualifying service:

Cancers Covered Under 38 CFR § 3.309(d)(2)

Important exclusion: Chronic lymphocytic leukemia (CLL) is specifically excluded from the 38 CFR § 3.309(d) presumptive list. Veterans with CLL who served at qualifying radiation risk activity locations are not automatically covered under the standard atomic veteran presumptive. However, CLL is covered under separate presumptives for specific groups — including as a herbicide-related presumptive for veterans exposed to Agent Orange and similar herbicides.

Also see our guide: Radiation Exposure VA Claims: Complete Guide

The Dose-Based Alternative Pathway (38 CFR § 3.311)

For veterans who have cancers or conditions not listed in § 3.309(d) — or who have radiation exposure from sources other than the designated RRA locations — there is an alternative pathway under 38 CFR § 3.311 that uses dose reconstruction to assess probability of causation.

Under the dose-reconstruction pathway:

1. VA requests a dose estimate from the Defense Threat Reduction Agency (DTRA) based on available records, location data, and modeling
2. The National Institute for Occupational Safety and Health (NIOSH) or another designated entity calculates a "probability of causation" (PC) based on the estimated dose and the veteran's cancer type and latency period
3. If the PC is 50% or greater, VA presumes causation and grants service connection
4. If PC is below 50%, VA must weigh it as one factor along with all other evidence

This pathway is significantly more complex and less favorable than the § 3.309(d) presumptive list. If your cancer is on the § 3.309(d) list, you should never need to use § 3.311. The dose pathway exists primarily for: (1) cancers not on the presumptive list; (2) radiation exposure from sources not qualifying as RRA (such as occupational X-ray exposure during service).

RECA vs. VA Benefits: Understanding Both Programs

Many atomic veterans (and their survivors) do not realize they may qualify for benefits under two separate federal programs. These programs are not mutually exclusive — receiving benefits from one does not disqualify you from the other.

RECA Onsite Participant Category

RECA's "onsite participant" category covers individuals (including civilians and contractors, not just military) who were present at U.S. atmospheric nuclear test sites during testing operations. The RECA payment for onsite participants is $75,000. If you have already received RECA compensation as an onsite participant, this does not reduce your VA disability compensation entitlement.

RECA Downwinder Category

RECA also covers civilians who lived in designated "downwinder" communities near Nevada Test Site or the Pacific Proving Grounds and who developed specific cancers. This category does not generally apply to military veterans filing VA claims, but family members of atomic veterans living in downwinder zones should be aware of it.

Filing Your Atomic Veteran VA Claim: Step by Step

1. Identify your qualifying radiation risk activity. Review the list in § 3.309(d)(3) and identify which qualifying location and time period applies to your service. You may qualify under multiple categories.
2. Gather service documentation. Your DD-214 establishes basic service history. For RRA participation, you need more specific records: unit assignment records showing you were present at the qualifying location during the qualifying period. The DTRA nuclear test participant database (see below) is essential for test site veterans.
3. Obtain a medical diagnosis. VA needs a current confirmed diagnosis of a condition on the § 3.309(d)(2) presumptive list. If you have been diagnosed with a radiogenic disease, obtain complete medical records including pathology reports.
4. Complete VA Form 21-526EZ. Indicate you are filing under 38 CFR § 3.309(d) for a radiogenic disease related to participation in a radiation risk activity. Specify the exact qualifying location and dates.
5. Submit all evidence upfront. Include: service records, DTRA records (if obtained), complete medical records, and any RECA award documents (showing your exposure was already officially recognized).
6. Request priority processing if urgently needed. Terminal illness, advanced disease, or financial hardship may qualify your claim for expedited processing.

Getting Radiation Exposure Records from DTRA

The Defense Threat Reduction Agency (DTRA) maintains the Radiation Dose Assessment and Recording (RADR) system — the primary database of recorded radiation exposures for military nuclear test participants. DTRA can provide:

• Confirmation that a specific veteran participated in atmospheric nuclear testing at a designated location
• Recorded dosimetry data (film badge readings, if available)
• Unit/organization information from test archives
• Test participation certificates

To request DTRA records, write to:

Defense Threat Reduction Agency (DTRA)
ATTN: DTRA-SCC-NE
8725 John J. Kingman Road, MS 6201
Fort Belvoir, VA 22060-6201

Include: veteran's full name (and maiden name if applicable), Social Security Number, date of birth, branch of service, dates of service, and the specific test site/operation the veteran believes they participated in. DTRA responses can take several months — request records early in the claims process.

Importantly, absence of dosimetry records from DTRA does not disqualify a claim. Many dosimeters were lost, damaged, or never returned. DTRA absence records should be accompanied by unit records and personal statements documenting presence at the qualifying location.

Survivor DIC Claims for Atomic Veterans

Many atomic veterans have already passed away — often from the very radiogenic diseases covered under § 3.309(d). Their surviving spouses, dependent children, and dependent parents may be eligible for Dependency and Indemnity Compensation (DIC) under 38 U.S.C. § 1310 if:

• The veteran had qualifying service at a designated radiation risk activity location
• The veteran's cause of death was a radiogenic disease listed under § 3.309(d)(2)
• The survivor is the veteran's lawful surviving spouse, a dependent child, or a dependent parent
• The claim is filed on VA Form 21P-534EZ (surviving spouse/child) or 21P-535 (parent)

For DIC purposes, "cause of death" means the condition on the death certificate's immediate or underlying cause of death. If the death certificate lists "complications of leukemia" or "metastatic lung cancer," and the veteran served at Nevada Test Site during atmospheric testing, the DIC claim should succeed on presumptive grounds.

If Your Atomic Veteran Claim Is Denied

Atomic veteran claims are sometimes denied due to: missing service records (especially pre-1973 military records destroyed in the 1973 NPRC fire), failure to establish qualifying radiation risk activity service, or VA rater unfamiliarity with the § 3.309(d) framework. In these situations:

• Supplemental Claim with DTRA records: If your initial claim lacked DTRA documentation, request those records and file a Supplemental Claim with the new evidence
• Alternative records: Unit morning reports, muster rolls, buddy statements from fellow test participants, and photographs can corroborate qualifying service when official dosimetry records are missing
• VSO assistance: Atomic veteran claims benefit significantly from VSO assistance — organizations like the National Association of Atomic Veterans (NAAV) have extensive experience with these claims
• BVA appeal: Complex radiation claims may benefit from Board of Veterans' Appeals review, where a Veterans Law Judge with specialized training handles the claim