Kammala jumla mai zuwa: A shekara ta 1914 an sanya wannan rukunin a matsayin na 7th Division a matsayin wani ɓangare na babban sake fasalin Gardi na Kasa. A ranar 29 ga Yuni, 1916, an tattara rukunin na 7 a Mount Gretna kuma an tura shi zuwa El Paso, Texas, don yin aiki tare da iyakar Mexico a matsayin Regular
Tawagar hukunta ta shiga Mexico. Manjo Janar Charles M. Clement ya umurce shi, yana jagorantar Brigade na farko wanda ya ƙunshi 1st, 2nd, da 3rd Regiments, Brigade na biyu na 10th, 16th, da 18th Regiments, da kuma Brigade na uku na 4th, 6th, da 8th Regiments. Akwai kuma rundunar sojan doki da na bindigogi, da kamfanoni biyu na sojojin sigina da na'urorin kiwon lafiya. Sansanin da ke waje da El Paso ya sami lakabi 'Camp Stewart' bayan Janar Adjutant, Thomas J. Stewart. Ranar 19 ga watan Satumba, an tura brigade daya gida. Ranar 14 ga watan Nuwamba, 1st Artillery ya bar gida; 18th Infantry ya bar Pennsylvania a ranar 18 ga watan Disamba; da sauran sauran bangare tsakanin 2 zuwa 19 Janairu 1917. Ya bayyana cewa mafi yawan ɓangaren an cire shi daga sabis a ranar 23 ga Fabrairun 1917 a Philadelphia.