But after receiving thousands of records and declassified reports from the Army, it's confirmed that during the Cold War, the United States military conducted secret tests on unsuspecting people in the city of St. Louis. Lisa Martino-Taylor's life work has been to uncover details of the Army's ultra-secret military experiments carried out in St. Louis and other cities during the 1950s and 60s. This thing was secretive for a reason. They didn't have volunteers stepping up and saying, Yeah, I'll breathe zinc cadmium sulfide with radioactive particles. These Army archive pictures show how the tests were done in Corpus Christi, Texas in the 1960s. In Texas, planes were used to drop the chemical, but in St. Louis, the Army placed chemical sprayers on buildings and station wagons. City officials were kept in the dark about the tests. The Cold War cover story was that the Army was testing smoke screens to protect cities from a Russian attack.