Not the highest. Highest is General of the Armies. He was one step below, which is just a General
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In the United States Army the highest ranking officer is a General. Bellow him is a Lietenant General. But the highest rankin officer is a four star general deemed chief of staff
The highest ranking officer in the Army is the Army Chief of Staff. The current Army Chief of Staff is General Martin Dempsey.
It would depend on which 'army' you are referring to. Generally, a Field Marshall is the highest rank in an army.
From start to finish the commander of the AEF was General John J. "Blackjack" Pershing. When the AEF was sufficiently large enough to form a field army Pershing also commanded the First US Army. When there were enough divisions to form the Second United States Army, Pershing moved up to command the American Army Group, Lieutenant General Hunter Liggett took over First Army, and Lieutenant General Robert Bullard commanded Second Army. The Third US Army was formed four days before the Armistice, and saw no action. It was initially commanded by Major General Joseph Dickman.
In some militaries, Field Marshall is the highest rank - basically equivalent to the highest ranking General of militaries which don't have the rank. They're basically top dog in that military.