Tens of thousands of troops were used in testing conducted by the U.S. military between 1922 and 1975. The military wanted to learn how to induce symptoms such as fear, panic, hysteria, and hallucinations" in enemy soldiers. Those who are still alive are part of a class action lawsuit against the Army. If they're successful, the Army will have to explain to anyone who was used in testing exactly what substances they were given and any known risks, [as well as] provide those veterans with health care for any illnesses that result, in whole or in part, from the testing. At least 70,000 troops were used in the testing. Researchers kept information about which agents they were administering from test subjects, [referring to the agents by] code names such as CAR 302668. That's one of the agents, records show, that researchers injected into Frank Rochelle in 1968. In 1975, the Army's chief of medical research admitted to Congress that he didn't have the funding to monitor test subjects' health after they went through the experiments. Since then, the military says it has ended all chemical and biological testing. Test subjects like Rochelle say that's not enough. "We were assured that everything that went on inside the clinic, we were going to be under 100 percent observation; they were going to do nothing to harm us," he says. "And also we were sure that we would be taken care of afterwards if anything happened. Instead we were left to hang out to dry."