In February 1918, he was sent to Langres, France, to attend the American Expeditionary Force General Staff School. All officers from divisions that were not under orders for France were ordered to return home in May 1918, but Krueger stayed on as G-3 of the 26th Infantry Division. The French Army requested that Krueger be sent home due to his German origin, and Krueger was re-posted to the 84th Division, but he soon returned to France, as the 84th Division embarked for France in August 1918.