About this Unit
I Corps, also known as "America’s Corps," is a distinguished field army corps of the United States Army with a lineage dating back to World War I, when it was first activated in 1918. The corps played pivotal roles during World War II, participating in campaigns throughout the Pacific theater, including New Guinea and the Philippines. Reactivated for the Korean War, I Corps commanded United Nations forces in several major operations and remained a key component of U.S. military presence in Korea during the Cold War. In the 21st century, I Corps has been headquartered at Joint Base Lewis-McChord, Washington, and has deployed units in support of operations in Iraq, Afghanistan, and the Asia-Pacific region, emphasizing its enduring commitment to joint and multinational operations.
Historical Facts
•
Origins in World War I: I Corps was first activated in January 1918 during World War I, becoming one of the first American corps-level commands and participating in major operations on the Western Front, including the Second Battle of the Somme and the Meuse-Argonne Offensive.
•
World War II Leadership: During World War II, I Corps played a key role in the Pacific Theater, particularly in the New Guinea and Philippine campaigns, under the command of notable generals such as Robert L. Eichelberger.
•
Korean War Contributions: I Corps was a major American headquarters during the Korean War, orchestrating defensive and offensive operations, including the famous Inchon Landing and the drive towards the Yalu River.
•
Cold War Era: After Korea, I Corps was stationed in Japan, serving as the key American command in the Far East until the 1970s, reflecting the shifting focus of US military strategy during the Cold War.
•
Return to the United States: In 1981, I Corps returned stateside, establishing its headquarters at Joint Base Lewis-McChord, Washington, where it remains today as a major operational headquarters.
•
Joint and Coalition Operations: I Corps has participated in numerous joint exercises and real-world operations with allied nations, particularly in the Pacific Rim, enhancing international military cooperation and readiness.
•
Operation Iraqi Freedom: Elements of I Corps deployed to Iraq in support of Operation Iraqi Freedom, assuming command of Multi-National Corps – Iraq in 2009 and overseeing complex multinational operations.
•
Distinctive Shoulder Sleeve Insignia: I Corps’ insignia features a bold blue “I” on a white background within a blue circle, making it one of the simplest and most recognizable patches in the US Army.
•
Focus on the Indo-Pacific: In recent years, I Corps has been designated as America's operational headquarters for the Indo-Pacific region, highlighting its strategic importance in contemporary military planning.
•
First Corps Motto: The official motto of I Corps is “America’s Corps,” reflecting its broad operational responsibilities and its role as a premier fighting force within the US Army.
