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CBRN operations are the employment of tactical capabilities that counter the entire range of CBRN threats and hazards. These are done through CBRN proliferation prevention, CBRN counterforce, CBRN defense, and CBRN consequence management activities in support of operational and strategic objectives to combat CBRN and operate safely in CBRN environments.
Many state and nonstate actors (to include terrorists and criminals) possess or have the capability to possess, develop, or proliferate CBRN weapons. U.S. policy prohibits the use of chemical or biological weapons under any circumstances, but it reserves the right to employ nuclear weapons. Many potential enemies are under no such constraint. (Refer to FM 3-11 for more information.)