The Acoustic Bazooka is a 2002 prototype that seems to have dropped out of sight. Whoever created the illustration shown below is an obvious devotee of 1950's sf.
More recently, a device nicknamed the "acoustic bazooka," more formally known as the directed stick radiator... was developed to serve as either a voice-hailing signal device ... The original research effort, however, consisted of equipment development and was not intended to evaluate ... effects on humans. No results of any such testing have been published, to date, in the scientific literature. It has been suggested that the device could "have the capacity to knock people off their feet."
Unfortunately, it appears that the possible dangers of US have been much overrated.
When discussing the practical limitations of technology, however, Altmann suggested that, because of basic physical principles, the development ... is unlikely..."
I think they are missing out on the real potential of super-duper sound energy, anyway. The real use for an Acoustic Bazooka is the removal of obstacles.
Consider the original Acoustic Bazooka - Vavoom from the Felix the Cat cartoon.
Tiny Flying Robot Weighs Just One Gram
'Aerostat meant anything that hung in the air. This was an easy trick to pull off nowadays.' - Neal Stephenson, 1995.
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Humanoid Robots Building Humanoid Robots
''Pardon me, Struthers,' he broke in suddenly... 'haven't you a section of the factory where only robot labor is employed?''
Stratospheric Solar Geoengineering From Harvard
'Pina2bo would have to operate full blast for many years to put as much SO2 into the stratosphere as its namesake had done in a few minutes.'