I Corps is a major formation of the United States Army, primarily responsible for operations in the Pacific region. Established in 1943, it has played significant roles in various conflicts, including World War II and the Vietnam War. The corps is headquartered at Joint Base Lewis-McChord in Washington and is known for its rapid deployment capabilities. The structure of I Corps includes several divisions and support units, allowing it to conduct a wide range of military operations. It focuses on readiness, training, and joint exercises with allied forces, enhancing cooperation and effectiveness in multinational missions across the Indo-Pacific area.