A center for chemical weapons research was established at American University in Washington, D.C. to house researchers. The U.S. military paid to convert classrooms into laboratories. Within a year of setting up the center, the number of scientists and technicians employed there would increase from 272 to over 1,000. Industrial plants were established in nearby cities to synthesize toxic chemicals for use in research and armaments. Shells were filled with toxic gas in Edgewood, Maryland. Women were employed to produce gas masks in Long Island City.