Chemical defense
The methods, plans, and procedures involved in establishing and executing defensive measures against attack utilizing chemical agents [U. S. Department of Defense, p. 159].
Chemical defense - procedures involved in defensive measures against attacks using chemical agents [Vocabulary.com].
Chemical, biological, radiological, and nuclear defense - efforts to protect personnel on military installations and facilities from chemical, biological, radiological, and nuclear incidents. Also called CBRN defense [U. S. Department of Defense, p.158].
Chemical defense. Vocabulary.com. Retrieved from: https://www.vocabulary.com/dictionary/chemical%20defense