My dad worked at the Rocky mountain arsenal when he was 18 years old. I believe they were neutralizing sarin gas and mustard gas. They didn’t wear much in the way of hazardous materials protective gear way back then.
mustard gas
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Fort McClellan was an Army installation in Alabama that opened in 1917. It was also the storied home to the Army Chemical School, the only military facility in the U.S. where live chemical weapons training occurred as part of the Army’s chemical warfare unit. Among the chemicals tested were sulfur mustard as well as nerve agents. Today, it no longer exists as an Army base. In 1999, the Environmental Protection Agency shut down the base, labeling it a hazardous site. The area is so toxic that it is illegal to sink a well in the surrounding communities.