AA-1-class submarine
Videos
The AA-1 class was a class of three experimental submarines of the United States Navy, built toward the end of World War I, between 1916 and 1920, intended to produce a high-speed fleet submarine. The
USS AA-1 (SS-52)
4-inch/50-caliber gun
Videos
The 4″/50-caliber gun was the standard low-angle, quick-firing gun for the United States, first appearing on the monitor Arkansas and then used on "Flush Deck" destroyers through World War I and the 1
The gun from USS Ward which fired the first American shot of World War II at Pearl Harbor on 7 December 1941 at the State Capitol grounds in St. Paul, Minnesota.
4-inch/50-caliber gun on merchant ship SS Sommelsdijk