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U.S. Army Pioneer Infantry Regiments in the American Expeditionary Force (AEF)
Similar to combat engineers in the modern U.S. Army but with the added duties of providing battlefield and rear area general-purpose labor while also serving as reserve infantry regiments assigned to the AEF's Corps headquarters, Pioneer Infantry regiments were created as part of the U.S. Army's expansion in fielding the AEF in World War 1.