Who led American troops during World War 1?

The Commander of the American Expeditionary Force (AEF), which was the US Army sent to fight in France, which eventually numbered two million men, was General John J. Pershing. But the overall Commander of the American Army is the Chief of Staff, and several officers held that position: William G. Wotherspoon was Chief of Staff when war broke out in Europe, until November 1914; Hugh L. Scott took over November 17, 1914 and held the job until September 22, 1917, and so was Chief of Staff for the first few months of US involvement in the war; Tasker H. Bliss took over September 23, 1917 and held the office until May 19, 1918; and Peyton C. March took over May 20, 1918, held the job through the end of the war, and on until June 30, 1921. All these officers theoretically "commanded" Pershing and the Americans in France. Pershing followed March as Chief of Staff, taking over July 1, 1921.