During WWII the government produced and distributed 78 RPM "Victory Discs," or V-Discs, to US troops all over the world. The records were to be destroyed after the war but many of them survived. :)
A lot of the V-Disc material was taken from radio programs like Command Performance; you can find out more in the book V-Discs: A History and Discography by Richard Sears.
Any error or typo is mine. :)
Since the gov't produced and distributed these records they are public domain but if you intend to make $ or otherwise profit from these files, please consider making a donation to a veteran's charity of your choice. Thanks. :)
Here's the links to the entire set of V-Discs that I've uploaded to Archive.Org:
V-Discs 1-99 (1943-1944)