This closeup focus on the USS R-4 which was in Submarine Division Nine, was armed with one 3-inch deck gun and four 21-inch torpedo tubes.
Categories: Ships and Submarines
 
 
Thank you to the Mario Family Foundation for enabling the digitization of the U.S. Naval Institute’s Photo Archive. The physical photos in the Photo Archive are stored in the Mildred M. Mario Photo Archive Room located at the U.S. Naval Institute’s Headquarters in Annapolis, MD.

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