The FCC today released a list of grants of experimental licenses.
A license has been issued to Hatfield & Dawson Consulting Engineers to operate an experimental station on 530, 890, and 1680KHz under a contract to the U.S. military "...to modernize and transform psychological operation equipment." (i.e., temporary portable radio stations)
When BAF Systems has received similar contracts, I'm afraid all they've aired is tone -- but that tone has been heard across a wide swath of the country!
WD2XUM are the calls.