acoustical surveillance
Oxford Dictionary of the US Military:
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acoustical surveillance
Employment of electronic devices, including sound-recording, -receiving, or -transmitting equipment, for the collection of information.
See the Introduction, Abbreviations and Pronunciation for further details.
US Defense Department Military Dictionary:
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acoustical surveillance
(DOD) Employment of electronic devices, including sound-recording, -receiving, or -transmitting equipment, for the collection of information.
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Oxford Dictionary of the US Military
The Oxford Essential Dictionary of the U.S. Military. Copyright © 2001, 2002 by Oxford University Press, Inc. All rights reserved.
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