Douglas MacArthur's Military branch?

Hello! I'm a high school junior researching about celebrated military figures for an assignment. I came across General Douglas MacArthur and got curious about what branch he was in. Can anyone here help me out with this information and maybe share what his contribution and impact in that branch was?

General Douglas MacArthur was part of the United States Army. His military career spanned five decades, and he played a major role in many pivotal events in American history during the early to mid-20th century.

His significant contributions came during World War II. MacArthur was already a key figure in the military, appointed to the role of Field Marshal of the Philippine Army by the Philippine Commonwealth in 1935, and coming out of retirement when World War II began.

During the war, he led the Pacific Campaign as Supreme commander, which involved recapturing territories such as the Philippines that had been lost to the Japanese Imperial Army. This campaign culminated in the Allied victory over Japan and MacArthur overseeing the signing of the Japanese Instrument of Surrender in 1945.

Perhaps one of his most significant impacts was during the post-war era. As Supreme Commander of the Allied Powers (SCAP) in Japan from 1945 to 1951, MacArthur led the efforts for Japan's reconstruction following World War II. This saw him oversee major political, social, and educational reforms that would help shape modern democratic Japan.

In 1950, he was appointed commander of United Nations forces at the start of the Korean War, earning several victories early on. However, his approach ignited controversy and led to his eventual relief by President Truman in 1951. Despite this, MacArthur remains a celebrated figure in military history for his vigorous leadership and strategic brilliance.