This was spotted at local Salvation Army for sale for $99.99. It indicates it is a U.S. Army Signal Corp with at date of January 1954 Sound Reproducer RP-104/UIH-2.
It obviously has a turntable so it probably was used for entertainment purposes, put it also has where you can plug in a microphone and speakers, so it was probably an announcement system as well and there is also and outlet that something could be plugged into (close up below).
I did find a link to part of a manual online found here and below is a diagram from Page 4 showing what it came with.
Page 4 from Manual found online.
