The 3"/50 caliber gun (spoken "three-inch-fifty-caliber") in United States naval gun terminology indicates the gun fired a projectile 3 inches (7.62 cm) in diameter, and the barrel was 50 calibers long (barrel length is 3" x 50 = 150" or 3.81 meters). Different guns (identified by Mark numbers) of this caliber were used by the U.S. Navy and U.S. Coast Guard from 1890 through the 1990s on a variety of combatant and transport ship classes.
Read more about 3"/50 Caliber Gun: Earlier Guns, Cold War Anti-aircraft Gun, Ships Mounting 3"/50 Caliber Mark 22 Guns
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“I’d like to say I didn’t intend to kill her. But when you have a gun ... you always intend ... when you have to.”
—Ketti Frings (1915–1981)