Project 112/ Shipboard Hazard and Defense (SHAD) Dept. of Defense tested biological and chemical warfare agents, by spraying several U.S. ships while 6,000 thousand of U.S. military personnel were aboard the ships. Veterans say they were not notified of the tests, and were not given any protective clothing. Chemicals tested included the nerve gases VX and Sarin, toxic chemicals such as zinc cadmium sulfide and sulfur dioxide, and a variety of biological agents. (Medical Countermeasures: Fact Sheets)