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When the Army Sprayed American Cities
The same investigation, restaged one beat at a time. Drive it with the arrow keys, space, or autoplay. Nothing is cut from the piece — long runs are split across frames. Read the full investigation or open the CIA Crimes hub.
When the Army Sprayed American Cities.
For 20 years the U.S. military secretly released bacteria and chemicals over its own cities to test a biowarfare attack — and called the germs harmless. They were not.
Not a conspiracy theory: the Army admitted 239 open-air biological tests to the U.S. Senate, under oath, in 1977. Unwitting civilians were the backdrop — and in San Francisco, one agent coincided with a deadly outbreak.
We grade the tests as fact, the 'harmless' claim as false, and the one death we can tie to it with care rather than certainty.
239 secret open-air tests, 1949–1969 — admitted to the Senate under oath.
In 1977 the Army told the Senate's health subcommittee it had run 239 open-air biological-agent tests between 1949 and 1969 (when Nixon ordered the bioweapons stockpile destroyed), at bases, at sea, and in public spaces across multiple cities. Kept secret for decades; surfaced via leaks, then confirmed to the Washington Post and New York Times.
Operation Sea-Spray (1950): the Navy fogged San Francisco — and a man died.
Sept 20–27, 1950: a Navy ship released Serratia marcescens and Bacillus globigii off San Francisco; monitors at 43 sites showed nearly all 800,000 residents inhaled thousands of particles each. On Oct 11, eleven people were hospitalized at Stanford with rare Serratia infections; Edward J. Nevin, 75, died three weeks later. The spray, exposure, outbreak, and death are FACT.
Did the spray kill Edward Nevin? Probably — but the Army denied it and his family lost.
The Serratia infection was so rare it was written up in the medical literature, and its timing/location line up with the spray — so many researchers treat Sea-Spray as the likely source. But the Army disputed the link, and when Nevin's son and grandson sued (1981–1983) they lost: the court shielded the government under sovereign immunity / the discretionary-function doctrine. PROBABLY TRUE — strong and widely accepted, never proven in court, formally contested.
The New York subway test (1966): bacteria smashed onto the platform at 23rd Street.
June 1966: Army scientists dropped Bacillus subtilis-filled bulbs onto the tracks at 23rd Street, letting trains pull the cloud through the system. Within minutes it was detected from 14th to 59th Street; the Army estimated 1M+ riders exposed over following days. Commuters had no idea.
The 'harmless simulants' claim — false.
Serratia marcescens is an opportunistic pathogen that can cause serious infection — exactly what the Stanford cases were — and Aspergillus fumigatus (another agent used) causes dangerous infections in the immunocompromised. 'Harmless' was a scientific-sounding cover for spraying unconsenting people, including the sick, elderly, and very young, with live microbes.
Zinc cadmium sulfide over St. Louis: documented tests, contested harm.
The Army also ran ZnCdS atmospheric-dispersion tests over Minneapolis, Corpus Christi, Fort Wayne, and St. Louis — in St. Louis, over low-income, largely Black neighborhoods without residents' knowledge (FACT). We stop short of the stronger claims — secret radioactive additives, cancer clusters: a 1997 National Research Council review found the exposures too low to cause harm. Tests = FACT; the radiological/cancer escalation = SOME SMOKE (real questions, not established, in one review refuted).
How this page is graded.
- FACT: the 239 tests (1977 Senate testimony); Sea-Spray and the ~800,000 exposed; the Stanford Serratia outbreak and Nevin's death; the 1966 NYC subway test; the ZnCdS dispersals over unwitting civilians.
- PROBABLY TRUE: that Sea-Spray caused Nevin's fatal infection — strong on rarity + timing, disputed by the Army, never proven in court (family lost on sovereign immunity).
- FALSE / MISLEADING: the 'harmless simulants' claim. SOME SMOKE: the ZnCdS radioactive-additive / cancer-cluster escalation (a 1997 NRC review found exposures too low for harm).
Why it matters.
This is the same Cold War machinery that produced the CIA's MKUltra — a national-security state that decided constitutional protections could be suspended for its own citizens if the experiment stayed secret. The Army's bioweapons work and the CIA's germ-and-drug program were literal neighbors at Fort Detrick, where Army scientist Frank Olson died in 1953 after the CIA dosed him with LSD. And when a family tried to hold the government responsible for a death, the courts said it couldn't be sued at all — the impunity The Untouchables documents.
Help us fill these lines.
- OpenA full public accounting of all 239 tests — locations, agents, and any health follow-up — much of which remains thinly documented.
- OpenWhether any long-term health effects in sprayed populations (e.g., St. Louis) were ever seriously studied rather than assumed away.
- OpenThe overlap in personnel and agents between the Army's open-air program and the CIA's MKNAOMI/MKUltra bio work at Fort Detrick.