What is the meaning of acoustic warfare countermeasures?

See acoustic warfare Part 2.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
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APAMilitary Dictionary (DoD). (2011). acoustic warfare countermeasures. Retrieved September 22, 2026, from http://smartdefine.org/acoustic_warfare_countermeasures/definitions/1960069
ChicagoMilitary Dictionary (DoD). 2011. "acoustic warfare countermeasures" http://smartdefine.org/acoustic_warfare_countermeasures/definitions/1960069 (accessed September 22, 2026).
HarvardMilitary Dictionary (DoD) 2011, acoustic warfare countermeasures, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/acoustic_warfare_countermeasures/definitions/1960069>.
MLAMilitary Dictionary (DoD). "acoustic warfare countermeasures" 4 April 2011. Web. 22 September 2026. <http://smartdefine.org/acoustic_warfare_countermeasures/definitions/1960069>