Newspaper: The Dallas Morning News
Date: August 14, 1980
Reporter: Barbara Strong, Washington Bureau of The News
Dateline: Washington
Principal subject: Secret U.S. Army chemical- and biological-warfare vulnerability tests conducted during the 1950s and 1960s.

Summary

The article reports that the U.S. Army conducted “hundreds” of chemical- and biological-warfare-related field tests over American and Canadian communities during the 1950s and 1960s. Many local residents—and apparently some cooperating organizations—were not told the tests’ complete military purpose.

According to Army spokesman Lee DeLorme, the stated objective was to determine how vulnerable North American cities would be to a Soviet chemical or biological attack. The Army dispersed tracer substances into the air, then measured how far they traveled, where they accumulated, and how effectively a city or region could be covered by an aerosol cloud.

The article was significant because it showed that the experiments were not confined to remote military proving grounds. They occurred in populated cities, industrial districts, coastal regions, and public transportation systems.

Locations named in the article

The Minneapolis experiments

The article says the Minneapolis tests occurred between January and March 1953. Zinc cadmium sulfide was reportedly released 61 times, with homes and schools located within the test area.

Army documents described the broader purpose as obtaining field data needed to estimate the quantity of material or munitions that would be required for the strategic use of chemical and biological agents against “typical target cities.”

The tracer was released at night through several mechanisms:

• An aerosol container
• A blower mounted on the back of a truck
• Dispensers placed on rooftops

Residents were reportedly given an incomplete explanation. They were told the work concerned smoke screens that might conceal a city during an atomic attack. The documents disclosed later showed that the Army was actually studying how biological-warfare-sized particles would spread through an urban population.

The St. Louis experiments

The clipping says that St. Louis officials were apparently aware that chemical-warfare-related studies were occurring, although the article questions whether they were told their complete purpose.

The St. Louis Park Commission reportedly cooperated. An Army document noted “minor difficulties” involving the commission because of a change in city administration. The article also reports industrial cooperation involving:

• The Socony-Vacuum refinery in East St. Louis
• Granite City Steel Company facilities in the Illinois portion of the St. Louis metropolitan region
• A major chemical business whose name is difficult to read in the surviving clipping

Later historical investigations established that St. Louis releases occurred from truck-mounted blowers, buildings and other stationary locations. Some releases particularly affected densely populated and predominantly Black neighborhoods.

The Army eventually acknowledged that the tests were part of its biological-warfare program—not simply smoke-screen research. A 1997 National Research Council assessment concluded that estimated public exposures were below levels expected to cause harm, but it also identified limited toxicological data and recommended additional research. National Academies

Claims made years later that St. Louis residents were also exposed to radioactive material have generated considerable concern, but direct documentary proof that radioactive substances were mixed into these releases has not been established. That claim should therefore be separated from the confirmed zinc-cadmium-sulfide testing.

Operation Dew

The East Coast portion of the article concerns Operation Dew, conducted in 1952.

The clipping reports that:

• Approximately 12,000 square miles covering parts of Georgia and the Carolinas were involved.
• Ships operated approximately five to ten miles offshore.
• Each test covered a route of roughly 150 miles.
• A fluorescent tracer was released into the atmosphere.
• Investigators measured whether the aerosol remained together and traveled from the ocean across populated land.

The objective was to determine whether an enemy could release a biological agent offshore and allow winds to carry it over a large portion of the United States.

The substance used was not described as an actual contagious pathogen. It was a traceable particulate material intended to imitate the aerodynamic behavior of biological-warfare particles.

Canadian tests

The article identifies Winnipeg, Manitoba, as one of the Canadian test locations. Canadian defense authorities reportedly acted on behalf of U.S. Army researchers.

Residents were told that the experiment would determine whether smoke could conceal a city or its important installations during an attack. The underlying military research, however, concerned the ability of an aerosolized agent to spread over an urban area.

This illustrates a recurring feature of the program: the public explanation was frequently narrower or less alarming than the actual chemical- and biological-defense objective.

New York City subway experiments

Although the short clipping provides few details, the New York reference concerns Army experiments in which biological simulants were released inside the subway system.

In the best-known 1966 test:

• Army personnel placed or dropped containers resembling ordinary light bulbs onto subway tracks.
• When the bulbs broke, they released a powder containing Bacillus globigii, now generally called Bacillus atrophaeus.
• Trains pushed the particles through stations and tunnels.
• Sampling devices measured how quickly and widely the organism spread.

The purpose was to determine how a biological attack at one subway location could expose people across a much larger transit network.

The Army regarded the organism as harmless at the time. Modern assessments describe it as generally low-risk but not absolutely incapable of causing opportunistic infection in vulnerable people. Therefore, describing it as a simulant is more accurate than calling it completely harmless.

The San Francisco test and Edwin Nevin

The article refers to a lawsuit brought by relatives of Edward J. Nevin—the clipping appears to print the name as “Edwin Nevins.”

In September 1950, during Operation Sea-Spray, a Navy vessel released biological simulants offshore from San Francisco. Coastal winds carried the particles across the city. The materials included:

• Serratia marcescens
• Bacillus globigii

Soon afterward, several patients at Stanford Hospital developed unusual Serratia urinary-tract infections. Nevin, an elderly patient recovering from prostate surgery, developed an infection involving Serratia marcescens and died.

His family later sued the federal government, alleging that the secret release caused his infection and death. The government prevailed because the court found that the family had not proved a direct causal chain between the military release and Nevin’s infection.

That ruling did not mean the secret release never happened. The release is documented. The unresolved issue was whether it could legally and scientifically be proven to have caused Nevin’s particular illness.

What “chemical and biological agents” means in this article

The headline and opening language may give the impression that the Army released lethal chemical-warfare agents or contagious battlefield pathogens over every location. The surviving documentation requires a more precise distinction.

Most of the public-area tests discussed here used simulants or tracers, including:

• Zinc cadmium sulfide
• Bacillus globigii/Bacillus atrophaeus
• Serratia marcescens
• Other fluorescent or microbial tracers

These materials were selected because they could imitate the size, movement or dispersal of a warfare agent and could later be detected in air or surface samples.

Nevertheless, the experiments remain controversial because:

1. The public was generally not asked for consent.

2. Residents were not always told what was being released.

3. Local authorities sometimes received misleading cover explanations.

4. Materials considered harmless at the time were not necessarily risk-free.

5. People with illnesses or weakened immune systems could have faced different risks than healthy military researchers.

6. The releases occurred around homes, schools, businesses and public transportation.

7. Meaningful long-term health surveillance was generally absent.

Later scientific assessment

A National Research Council committee later studied the Army’s zinc-cadmium-sulfide releases. It estimated that public exposure was far below occupational levels known to produce cadmium poisoning and concluded that the releases were not expected to have caused recognizable harm.

However, the committee also acknowledged important limitations:

• Historical exposure records were incomplete.
• Some release and sampling information was uncertain.
• Evidence about how zinc cadmium sulfide breaks down inside the lungs was limited.
• Epidemiological studies directly tracking exposed communities were largely unavailable.

The committee recommended additional toxicological research. Its full assessment is available through the National Library of Medicine’s Bookshelf.

Overall conclusion

The central allegation in the 1980 Dallas Morning News article is substantially supported by later-released government records: the Army conducted a large, secretive Cold War program to determine how chemical and biological aerosols would spread across cities and populated regions.

The article does not establish that lethal warfare agents were released in every named community. Much of the testing used tracers and organisms then classified as simulants. But the secrecy, misleading public explanations, lack of informed consent and uncertain risks make these experiments an important example of Cold War military research conducted on unwitting populations.