I do not have a pic of the radioman's .30 cal 'Stinger'  variation machine gun which was rearward facing and behind him.  He could traverse it, but only could aim basically level and down.  The Stinger had a higher rate of fire than a normal .30, and ground troops in the Pacific Theater comshawed them, installed homemade wooden stock, and carried and used them with great effectiveness.  There was one Marine honored with the CMH, credited with saving many men with his Stinger.

Charlie, W4MEC in NC