Hello Cindy, thank you for posting your request on History Hub.
After searching our catalog, we were able to find a few entries that may be of interest to you. From record group 70: Records of the US Bureau of Mines, Summaries of Poison Gas Research, 1918 - 1918. From Record Group 338: Records of U.S. Army Operational, Tactical, and Support Organizations (World War II and Thereafter), 1917 - 1999, Treatment for War Gasses Records, 6/1944 - 5/1945. These records are held at National Archives in College Park, Maryland, and you can reach them at Archives2reference@nara.gov.
From Record Group 171: Records of the Office of Civilian Defense, 1939 - 1945, Gas Injuries, n.d, 1942 - 1942. These records are held at National Archives at College Park - Still Pictures (RDSS) in College Park, Maryland, and you can reach them at firstname.lastname@example.org.
We hope this is helpful and best of luck with your research. Let us know if you have any follow up questions.