During the Cold War, the US armed forces not only exposed their own civilian population to the radioactive fallout from their atomic bomb tests. Citizens of Minneapolis, St. Louis and Corpus Christi, Texas were also sprayed with toxic chemicals without their knowledge in the 1950s and 1960s. This emerges from a report that comes from the headquarters of the US Army's special biological warfare unit at Fort Detrick. In Minneapolis in 1953, the poison warriors sprayed the substance zinc cadmium sulfide from trucks and house roofs. Cadmium, which damages the lungs and kidneys, can cause cancer. The tests with the fluorescent material served to better understand the potential for biological and chemical weapons to spread. Several women who attended a primary school in the sprayed area as children now claim to have suffered damage from the poison experiments, including infertility, cancer and miscarriages. A spokesman for the US Army, however, asserted that the cadmium contamination was below any danger level.