Seriously, When I worked for Electrospace we produced "FOLS" Family of Loud Speakers, a Highly portable HIGHLY LOUD system just for Psyops use.
Anything on a loop will drive folks LOOPY!.....But Imagine if you could make the enemy think that there was entire armoured column coming thier way!! Psyops is kinda Kewl.
And Im sure the Army has a Kewl sound System.