Saturday, February 7, 2026

U.S. Navy and Fort Detrick Scientists Secretly Sprayed San Francisco With Bacteria in 1950, Exposing an Entire City Without Consent



SAN FRANCISCO — In September 1950, the United States Navy deliberately released clouds of bacteria over San Francisco, subjecting nearly the city’s entire population to a covert biological warfare experiment conducted without consent, warning, or medical oversight, according to declassified government records and subsequent congressional investigations.

The operation, known as Operation Sea-Spray, was not disclosed to city officials, doctors, or residents. For seven consecutive days, Navy personnel aboard a ship stationed offshore dispersed aerosolized bacteria into coastal fog, allowing prevailing winds to carry the material deep into residential neighborhoods, hospitals, schools, and workplaces.

The purpose was explicit: to determine how effectively a biological agent could blanket a major American city.


A City Used as a Test Subject

Internal Navy and Defense Department documents later revealed that Operation Sea-Spray was part of a broader Cold War biological warfare program designed to study both defensive vulnerability and offensive capability. San Francisco was selected precisely because it was densely populated, geographically enclosed, and meteorologically ideal for aerosol dispersion.

The Navy calculated that nearly 800,000 civilians were exposed.

The bacteria released included Serratia marcescens and Bacillus globigii, organisms publicly described by the military at the time as “harmless simulants.” That claim would later collapse under scientific and medical scrutiny.


The Navy Units That Executed the Operation

Declassified records identify the units directly responsible for the release:

  • U.S. Navy Special Operations Division (SOD), headquartered at Fort Detrick, Maryland, which planned and coordinated the experiment

  • Naval Chemical Warfare Service (NCWS), which provided scientific oversight, aerosol dispersal methods, and biological agents

  • USS George Eastman, the Navy vessel used to spray the bacteria offshore using specialized dissemination equipment

Post-operation Navy assessments praised the test not for safety, but for effectiveness, concluding that aerosol coverage reached most or all of the metropolitan area.


Fort Detrick: The Scientific Command Center

Operation Sea-Spray was not an isolated Navy field test. It was designed, overseen, and evaluated by scientists and commanders at Fort Detrick, the central hub of America’s biological weapons program, where military research overlapped with intelligence operations.

Officials with direct command or scientific responsibility during the period included:

Brig. Gen. William M. Creasy

  • Commander of Fort Detrick from 1948 to 1951

  • Oversaw all biological warfare research and field testing during Operation Sea-Spray

  • Approved and coordinated open-air dispersal tests involving civilian environments

Creasy later defended such tests as “necessary to determine operational feasibility.”


Dr. Ira L. Baldwin

  • Scientific Director of the U.S. Army Biological Warfare Laboratories

  • One of the architects of the U.S. biological weapons program during and after World War II

  • Helped establish protocols for large-scale aerosol dissemination

After retirement, Baldwin acknowledged that the United States conducted tests “in populated areas where results could not be duplicated in laboratories.”


Dr. Theodore Rosebury

  • Senior microbiologist at Fort Detrick

  • Specialist in aerosolized bacteria and dispersal mechanics

  • Later author of Peace or Pestilence?, in which he conceded that U.S. biological warfare research deliberately exposed civilians without their knowledge

Rosebury described such exposure as “regrettable but intentional.”


Dr. Frank Olson

  • Fort Detrick scientist and Army biochemist involved in aerosol and biological research

  • Later became directly linked to CIA experimentation

  • Died in 1953 after being covertly dosed with LSD by government colleagues

Olson’s role illustrates the direct personnel overlap between Fort Detrick, the Pentagon, and the CIA.


Hospitals Report Infections. One Man Dies. The Government Says Nothing.

Within days of the bacterial release, San Francisco hospitals reported an unusual spike in rare Serratia marcescens infections—organisms almost never seen in healthy patients.

Eleven people were hospitalized with serious bloodstream and urinary tract infections. One of them, Edward Nevin, died after the bacteria entered his heart valve.

Doctors were baffled. No public health alert was issued. No investigation linked the outbreak to a military operation because no one outside the Navy knew the experiment had occurred.

The federal government remained silent.


Decades of Denial and Legal Evasion

For years, the Navy denied that Operation Sea-Spray posed any risk or caused harm. The truth did not emerge until the 1970s, when congressional investigations into U.S. chemical and biological weapons programs forced the operation into public view.

When the Nevin family attempted to sue, federal courts dismissed the case, citing sovereign immunity, shielding the government even in cases involving non-consensual human experimentation.

No Navy officer was disciplined.
No criminal charges were filed.
No formal apology was issued.


Ethics Violated, Laws Ignored

Even by 1950 standards, the operation violated established ethical norms.

The Nuremberg Code, adopted after World War II and used by the United States to prosecute Nazi officials, explicitly required informed consent for human experimentation. That standard was ignored when applied to American civilians.

Modern experts agree that if conducted today, Operation Sea-Spray would violate:

  • Federal human-subject research laws

  • International biological weapons conventions

  • Core principles of medical ethics

Internal Navy assessments acknowledged success only in terms of coverage, not safety.


From Sea-Spray to the CIA: Program Continuity

Operation Sea-Spray directly informed later Pentagon and CIA programs, not just in data but in doctrine, personnel, and institutional culture.

Project SHAD (Shipboard Hazard and Defense)

  • Conducted by the Pentagon in the 1960s

  • Exposed U.S. service members to chemical and biological agents without informed consent

  • Built directly on dispersal data first gathered during Sea-Spray


Project MK-NAOMI

  • The CIA’s biological and chemical weapons program

  • Used Fort Detrick scientists and facilities

  • Focused on assassination tools, incapacitating agents, and covert delivery systems

Fort Detrick served as MK-NAOMI’s scientific backbone.


MK-ULTRA

  • Known for psychological experimentation

  • Relied heavily on Fort Detrick researchers

  • Operated under the same logic established during Sea-Spray: national security superseded consent


Congress Confirms the Pattern

The Church Committee and subsequent congressional hearings in the 1970s concluded that:

  • Open-air biological testing on civilians did occur

  • Fort Detrick scientists played central roles

  • The CIA and Pentagon inherited and expanded these practices

  • Records were incomplete, destroyed, or deliberately obscured

One Senate investigator described the system as “a culture of impunity operating under classified cover.”


A Pattern, Not an Anomaly

Operation Sea-Spray was part of a nationwide program that included similar covert releases in:

  • New York City subway tunnels

  • St. Louis housing projects

  • Minneapolis, Winnipeg, and other urban centers

All were conducted without public knowledge or consent.

Together, they establish a documented pattern: the U.S. government knowingly used civilians as unwitting test subjects in biological warfare experiments.


The Reckoning That Never Came

No memorial marks the exposure.
No comprehensive health study was ever conducted.
No official record of all exposed civilians exists.

The truth arrived decades too late—buried in declassified files and legal rulings—long after those affected were denied even the chance to consent.

Operation Sea-Spray was not a mistake, not a misunderstanding, and not harmless.

It was a deliberate military experiment, planned by Navy units, designed and overseen by Fort Detrick scientists, authorized through Pentagon command structures, and later extended into CIA covert programs.

San Francisco was the test case.
The Cold War was the expansion.
Accountability never arrived.

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