Unidentified Ship Speakers?

[SRFANDTRF]

Hello!  Many years ago I acquired some ship speakers/reproducers from a collector and just re-discovered them as I have retired and am cleaning out my basement.

There are four of them and three of them are still in their original un-opened crates but one was opened, I assume someone wanted to view them.  They are enclosed in a air-tight bag with desiccant bags.   

I have searched for hours and hours and have been unable to find information on these units.  They were made by Jensen for the military and seem to be very unique.   

I have attached pictures of these which include shipping information and model numbers.   I would be very excited to hear if anyone is familiar with these!