Dugway Proving Ground - "Dugway Sheep Kill" Incident

"Dugway Sheep Kill" Incident

In March 1968, 6,249 sheep died in Skull Valley, an area nearly thirty miles from Dugway's testing sites. When examined, the sheep were found to have been poisoned by an organophosphate chemical. The sickening of the sheep, known as the Dugway sheep incident, coincided with several open-air tests of the nerve agent VX at Dugway. Local attention focused on the Army, which initially denied that VX had caused the deaths, instead blaming the local use of organophosphate pesticides on crops. Necropsies conducted on the dead sheep later definitively identified the presence of VX. The Army never admitted liability, but did pay the ranchers for their losses. On the official record, the claim was for 4,372 "disabled" sheep, of which about 2,150 were either killed outright by the VX exposure or were so critically injured that they needed to be euthanized on-site by veterinarians. Another 1,877 sheep were "temporarily" injured, or showed no signs of injury but were not marketable due to their potential exposure. All of the exposed sheep which survived the initial exposure were eventually euthanized by the ranchers, since even the potential for exposure had rendered the sheep permanently unsalable for either meat or wool.

The incident, coinciding with the birth of the environmental movement and anti-Vietnam War protests, created an uproar in Utah and the international community. The incident also starkly underscored the inherent unpredictability of air-dispersal of chemical warfare agents, as well as the extreme lethality of next-generation persistent nerve agents at even extremely low concentrations.