Image courtesy of U.S. Department of Energy / Nevada Test Site (via AtomicArchive.com)
The Nevada Site Office (NSO) in Las Vegas was not a nuclear weapons facility or uranium mill; it was the command center for America’s nuclear testing era. From the early Cold War through the end of nuclear testing, this office managed some of the most significant nuclear weapons testing and cleanup activities in U.S. history, primarily at the Nevada Test Site (NTS) which is now known as the Nevada National Security Site (NNSS). Thousands of scientists, technicians and support staff worked at NSO to oversee 928 nuclear tests from 1951–1992.
While atmospheric and underground detonations occurred at testing sites miles away from Las Vegas, NSO staff routinely traveled from the NSO’s North Las Vegas Complex to testing areas and then returned. They worked directly with test planning, diagnostics, instrumentation, logistics, radiation monitoring and data analysis of blast and fallout effects. Their roles were essential to weapons development and refinement and some of NSO’s radiation monitoring techniques are still used today.
The NSO’s work mattered because it:
Together, these responsibilities made the NSO one of the most important federal facilities in the entire U.S. nuclear security enterprise.
Las Vegas itself became deeply intertwined with testing culture, normalizing exposure risks through tourism and media coverage, even as workers and residents absorbed long-term consequences.
1951: Nevada Test Site was established, and Las Vegas became the operational hub for the Nevada Site Office. Nuclear tests coordinated through NSO were sometimes visible from Las Vegas, earning the city the nickname “Atomic City.” Some casinos hosted “atomic test viewing parties” for tourists.
1952–1974: Atomic Energy Commission (AEC) directed nuclear testing programs administered through the Nevada Site Office. Many NSO workers were AEC or AEC contractor employees during the height of testing.
1974: Energy Research and Development Administration (ERDA), a short-lived U.S. government agency created by the Energy Reorganization Act of 1974, replaces the AEC.
1977: The ERDA ends its services and the Department of Energy (DOE) assumes control.
1992: U.S. ends nuclear weapons testing.
1992–Present: Federal focus shifts to environmental cleanup efforts, radiation containment, long-term stewardship, and national security missions. The Nevada Site Office evolved into today’s Nevada Field Office, which oversees cleanup and ongoing monitoring at NNSS under DOE and the National Nuclear Security Administration (NNSA).
NSO workers may have experienced occupational exposure to ionizing radiation, radioactive fallout, and hazardous materials through site visits, instrumentation work, radiation monitoring, or weapons-related research. These exposures have since been linked to increased risks of various cancers, thyroid disease, respiratory conditions, and other long-term health effects, depending on job duties and duration of employment.
In 2002, the discovery of beryllium contamination in buildings B-1, B-2, B-3, and A-1 at the North Las Vegas Complex led to the immediate halt of operations and the relocation of employees due to concerns over potential exposure.
The Nevada Site Office is an approved facility for The Energy Employees Occupational Illness Compensation Program or the EEOICPA White Card Program.
As of January 2026, Nevada Site Office workers have received over $235 million in EEOICPA compensation and medical bills paid.
Let us check if you or a loved one qualifies for up to $400,000 plus free medical care in the comfort of home.
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A: The Nevada Site Office (NSO) managed nuclear weapons testing activities at the Nevada Test Site, now called the Nevada National Security Site (NNSS). Its responsibilities included test planning, logistics, radiation monitoring, and data analysis. After nuclear testing ended in 1992, its work shifted toward environmental cleanup, long-term stewardship, and national security missions.
A: No. The Nevada Site Office was the management and operational hub in the Las Vegas area, while the Nevada Test Site was the location where nuclear detonations occurred. Some NSO staff traveled between office facilities and testing areas. A worker’s actual work locations, duties, and employment dates matter when evaluating EEOICPA eligibility.
A: Former Nevada Site Office workers may qualify for EEOICPA benefits if they meet covered employment requirements and have a qualifying illness. Eligibility depends on factors such as employer, employment dates, diagnosis, and applicable exposure requirements. Certain surviving family members may also qualify. The U.S. Department of Labor evaluates each claim.
A: Nevada Site Office workers may have encountered ionizing radiation, radioactive fallout, and hazardous materials through testing-area visits, radiation monitoring, instrumentation work, and research. Beryllium contamination was also discovered in buildings B-1, B-2, B-3, and A-1 at the North Las Vegas Complex in 2002. Potential exposure alone does not establish EEOICPA eligibility.
A: Yes. Retirement does not automatically prevent former Nevada Site Office workers from qualifying for EEOICPA benefits. A qualifying illness may be diagnosed years after employment ends. Applicants must still meet the program’s employment and medical requirements, and some compensation components have additional rules.
A: Trusted Ally helps former Nevada Site Office workers and their families understand the EEOICPA program and navigate next steps, including questions about eligibility, employment records, and medical documentation. For workers with approved benefits, Trusted Ally can also explain home healthcare options for accepted conditions. The U.S. Department of Labor determines eligibility and approves benefits.
A: Former Nevada Site Office workers and their families can call Trusted Ally at (866) 286-6426 for guidance on the EEOICPA program, questions about next steps, and information about home healthcare services for approved conditions.