[Milsurplus] Clandestine RBO receivers?

[Nick England]

Communications area - 1972 USS Pyro
http://www.navy-radio.com/ships/ae22/ae24-radio-1972.jpg
What are those two black units to the left of the TTY gear?
http://www.navy-radio.com/ships/ae22/ae24-mys-1972.jpg

RBO with some sort of cover over the dial? Why??
Here is an RBO-2 that looks like it has fittings to attach a cover??
http://www.navy-radio.com/rcvrs/ww2/rbo/rbo2-1305-11.JPG

Cheers,
Nick England K4NYW
www.navy-radio.com
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