The Priscilla event, part of Operation Plumbbob conducted at the Nevada Test Site in 1957, was a 37-kiloton device exploded from a balloon.
Credit U.S. Department of Energy
Joel Healy and his daughter, Kelli Healy Salazar. Healy was a 17-year-old Army soldier in 1957 when he witnessed Operation Plumbbob, one of the largest nuclear bomb tests ever conducted on American soil.
NATO observers attend the Boltzmann Event detonation on May 28, 1957, at Nevada Test Site. The detonation was part of Operation Plumbbob.
In 1957, Joel Healy witnessed one of the largest nuclear tests ever conducted on U.S. soil.
Healy was in the U.S. Army, stationed in the Nevada desert north of Las Vegas at Camp Desert Rock. He was 17 years old and a private first class at the time.
Healy drove dump trucks, moved materials, and built structures, like houses, that would be destroyed by the explosions so the Army could study the effects of a nuclear blast. He also helped build the towers where many of the bombs were detonated.