Enginemen 3rd class

**Enginemen 3rd Class (EN3)** is a United States Navy enlisted rating responsible for operating, maintaining, and repairing internal combustion engines and related systems aboard naval vessels. The rating originated during World War II, when the complexity and number of shipboard engines increased dramatically, necessitating specialized technical roles. Over the decades, Enginemen 3rd Class have played crucial roles in ensuring the operational readiness of ships, submarines, and shore installations, particularly in propulsion, electrical generation, and auxiliary machinery. Through conflicts such as the Korean War, Vietnam War, and into the modern era, EN3 sailors have been essential in keeping the Navy’s fleet moving and mission-ready around the globe.