The 5-inch/38 caliber gun is a naval artillery piece used primarily by the United States Navy during the 20th century. It has a caliber of 5 inches (127 mm) and a barrel length of 38 calibers, meaning the barrel is 190 inches long. This gun was designed for both anti-ship and anti-aircraft roles, making it versatile in combat situations. Introduced in the 1930s, the 5-inch/38 caliber gun was mounted on various ships, including destroyers and cruisers. It could fire a range of ammunition types, including high-explosive and armor-piercing shells, with a maximum range of about 15 miles. Its effectiveness contributed to naval operations during World War II and beyond.