509th Inf 509th directed the formation of a

directed the formation of a Ranger battalion

one brigade of U

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the American Expeditionary Force (AEF) was committed to combat in the spring of 1918 in a desperate attempt to halt a German advance toward Paris

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509th Inf 509th directed the formation of a509th Parachute Infantry Battalion Geronimo The 509th Infantry Regiment, previously titled the 509th Parachute Infantry Regiment was the first parachute infantry unit of the U. S. Army to make a combat jump during World War II. Currently its 1st and 3rd battalions are active. The 1st Battalion serves as the Opposing Force at the Army's Joint Readiness Training Center at Fort Polk, Louisiana. The 3rd Battalion is assigned to the 4th Brigade Combat