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Pentagon plans ultrasonic wepons of mass destruction

the device will purportedly use "directed ultrasound technology to enable the capability to significantly reduce sound emissions from large scale tactical military hardware," and they hope to lower noise by "at least 30-decibels" in order to allows troops to operate in close proximity to the enemy without being detected aurally.
Pentagon plans ultrasonic curtain to muffle loud tanks - Engadget
Sonic and ultrasonic weapons (USW) are weapons of various types that use sound to injure, incapacitate, or kill an opponent. Some sonic weapons are currently in limited use or in research and development by military and police forces. Others exist only in the realm of science fiction. Some of these weapons have been described as sonic bullets, sonic grenades, sonic mines, or sonic cannons. Some make a focused beam of sound or ultrasound; some make an area field of sound. Although many real sonic and ultrasonic weapons are described as "non-lethal", they can still kill under certain conditions, so the term "less-lethal" has been suggested for the sake of accuracy.
Sonic weaponry - Wikipedia, the free encyclopedia

military, government