About this Unit
The Machinist’s Mate (MM) is a key enlisted rating in the United States Navy, established in 1884 to operate, maintain, and repair shipboard mechanical equipment. Originally, Machinist's Mates were essential for operating steam engines aboard early steel warships, adapting over time as naval propulsion evolved from steam to diesel and nuclear power. During World War II, MMs played a vital role in keeping the Navy’s vast fleet operational across multiple theaters. Today, Machinist’s Mates serve on surface ships, submarines, and at shore facilities, ensuring the functionality of engines, auxiliary systems, and propulsion machinery critical to naval operations.
Historical Facts
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Origins in Steam Power: The Machinist’s Mate (MM) rating was established in the U.S. Navy in 1884, coinciding with the Navy’s transition from sail to steam-powered vessels.
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Nickname "Snipes": Machinist’s Mates, along with other engineering ratings, are often called "snipes"—a term that originated from British naval slang for engineers who worked below decks.
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Submarine and Surface Roles: MMs serve on both surface ships and submarines, operating and maintaining propulsion systems, auxiliary equipment, and nuclear reactors on nuclear-powered vessels.
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Vital During World War II: During WWII, Machinist’s Mates were critical in keeping ships operational, often performing repairs under fire during battles such as the Battle of the Atlantic and Pacific island campaigns.
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Nuclear Power Program: The Navy’s Nuclear Power Program, established in the 1950s, led to the creation of the Machinist’s Mate (Nuclear) specialty, making them among the most technically trained sailors in the fleet.
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Emergency Repairs: MMs are known for their ingenuity—stories abound of them fashioning parts from scrap or making emergency repairs with whatever materials were available to keep ships in the fight.
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Engineering Watches: MMs stand critical engineering watches, monitoring and adjusting everything from steam pressure to coolant flow, ensuring ship safety and propulsion at all times.
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Women in Engineering: Women first entered the Machinist’s Mate rating in the 1970s, and today, female MMs serve on both surface ships and submarines.
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Notable Alumni: Several former Machinist’s Mates have gone on to prominent careers, including politicians, astronauts, and inventors—showcasing the technical training provided in the role.
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Traditional Rivalries: There is a long-standing friendly rivalry between Machinist’s Mates and Electrician's Mates, each claiming their systems are most vital to the ship’s operation!
