Columbia subject headings:
Biological warfare--United States--Safety measures.
Chemical warfare--United States--Safety measures.
United States--Armed Forces--Safety measures.
Harvard subject headings:
Biological warfare--United States--Safety measures
Chemical warfare--United States--Safety measures.
United States--Armed Forces--Safety measures.
Princeton subject headings:
Biological warfare--United States--Safety measures.
Chemical warfare--United States--Safety measures.
United States--Armed Forces--Safety measures.