Kammala jumla mai zuwa: Da barkewar Yaƙin Duniya na I a watan Agusta 1914, an ba Krueger matsayi a matsayin mai sa ido tare da Sojojin Jamus amma an tilasta masa ya ƙi shi saboda alkawurran dangi. Maimakon haka, an tura shi zuwa 10th Infantry na Pennsylvania Army National Guard. An tattara rukunin a ranar 23 ga Yuni 1916 kuma ya yi aiki tare da iyakar Mexico na tsawon watanni biyar a matsayin wani ɓangare na
Rundunar Hukunci ta Mexico a karkashin Manjo Janar John J. Pershing, kodayake babu rukunin Tsaro na Kasa da suka yi yaƙi da sojojin Mexico. An tattara rukunin a watan Oktoba 1916.