It was quite easy. It was The Mighty KBC (the ID was right in the beginning of the recording) with the VOA Radiogram program (that voice you heard after the intro was my old friend Dr. Kim Andrew Elliott doing the intro just before the MFSK64 digital test).
You can see more information about these tests here...
VOA Radiogram
and here's a little bit about the station...
The Mighty KBC
In the future, please supply the date / time (preferably in UTC) and the frequency (in Khz) so folks can check their logs and use other references. Thanks for your future cooperation and your contribution
Mike