A report, commissioned by Air Force Press Officer Jesse Stay and first made public in 1998, was called the "first documented admission" from the Army that a nerve agent killed the sheep at Skull Valley.
[2] According to reports from New Scientist, Dugway was still producing small quantities of non-infectious anthrax of a type used in the making of vaccines as late as 1998, 30 years after the United States renounced biological weapons.
Bode, phoned Keith Smart, the chief of the ecology and epidemiology branch at Dugway to report that 3,000 sheep were dead in the Skull Valley area.
As the F-4 gained altitude after its bombing run, VX trickled out in a trail behind the aircraft, drifted into Skull Valley, north of the proving ground, and settled over a huge flock of sheep.
Circumstantial evidence seemed to support this assertion; the United States Army admitted to conducting open-air tests with VX in the days preceding the sheep kill.
Regular breathing and internal hemorrhaging are inconsistent with nerve agent exposure,[7] and "no other animals of any type, including cows, horses, dogs, rabbits, or birds, appeared to have suffered any ill effects, a circumstance that was hard to explain if VX had in fact caused the sheep deaths.
[4] The 1970 report, compiled by researchers at the U.S. Army's Edgewood Arsenal in Maryland, stated that VX was found in both snow and grass samples recovered from the area three weeks after the sheep incident.
Additionally, the probe showed that medical tests the Army had used to claim humans were not affected are now considered inconclusive, and the Pecks had shown other signs of low-level VX exposure.
[14] Author Richard Kadrey used the incident as inspiration for the name of a fictional metal band, Skull Valley Sheep Kill, in his Sandman Slim novel series.