Dahlgren gun line
Via the Naval General Board on FB: US Naval Surface Warfare Center Dahlgren Division naval gun line in June 1989:
Front to back, my best guesses:
5″/54 caliber Mark 42 gun
8″/55 caliber Mark 71 gun
OTO Melara 76 mm
8″/55 caliber gun Mark 16
5″/54 caliber Mark 42 gun
16″/50 caliber Mark 7 gun
Unknown, but maybe some form of 5″/54 caliber Mark 45 gun
OTO Melara 76 mm
Unknown
I think a 3″/50 caliber gun Mk33
The “Breech Block” of the Mk.42 is virtually identical with the Mk.45, with the differences is in the Barrel Design and the Grade of Steel used for the Mk.42 Gun Barrel. A simple Barrel Swap, using the Mk.45 Barrel will allow the usage of modern Mk.45 Munitions…