I'm sorry. I can't remember. There was this record that had some patriotic music of some sort recorded on it. They figured out what the music was from. It was recorded on a special large record that could only be played on a certain type of turntable.
(/me shimmies to History Detectives site really quick and searches for it.)
...Ah, okay here:
http://www.pbs.org/opb/historydetect...ntspecial.html
Not exactly for recruitment, but it was an official US Army recording.
(Sorry that my memory is terrible today.)
EDIT:
Take a look at
this.