Kammala wannan jumla: Dan wani jami'in soja, Drum yana halartar Kwalejin Boston lokacin da aka kashe mahaifinsa a lokacin yakin Spain-American. An ba da umarnin kai tsaye a cikin Sojojin Amurka, an nada Drum a matsayin mataimakin laftanan na Sojojin. Ya yi aiki a cikin Philippines a lokacin Philippine-American War, ya shiga cikin yakin Bayan, kuma ya sami lambar yabo ta Silver Star don jaruntaka. Ya ci gaba da ci gaba ta hanyar matsayi mafi girma da alhakin a farkon 1900s, kuma ya shiga cikin Veracruz da
Ƙungiyar 'Yan Tafiya ta Pancho Villa.