The 3-inch M1918 gun was a United States 3-inch anti-aircraft gun that entered service in 1918 and served until it was finally superseded by the 90 mm M3 gun just prior to the opening of World War II.
3-inch M1917 The predecessor of 3-inch M1918 gun was 3-inch M1917. Its was the first Army's dedicated anti-aircraft gun, entering service during World War I.
