Ku dhammee weedhan soo socota: Sanadkii 1911, intii uu ku sugnaa Fort Sam Houston, Texas, Hickam wuxuu qaatay tababar duulimaad marka lagu daro waajibaadkiisa caadiga ah. Bishii Janaayo 1914, waxaa loo wareejiyay 8th Cavalry, ka dibna Filibiin, isagoo yimid Xerada Stotsenberg bishii Diseembar 1913. Sannad ka dib waxaa loo dalacsiiyay inuu buuxiyo booska ugu horeeya ee Lieutenant ee 7th Cavalry, sidoo kale Camp Stotsenberg, wuxuuna ku soo laabtay 7th Cavalry ee Mareykanka bishii Diseembar 1915 ee Douglas, Arizona. Wuxuu ka soo shaqeeyey Mexico isagoo ka mid ahaa
Socdaalkii Ciqaabta ee Mexico wuxuuna ku arkay ficilkii Maarso 19, 1916 ee Guerrero; Abriil 22, Tomochic, Chihuahua, halkaas oo lagu abaalmariyay Xiddiga Lacagta ee ficil ka dhan ah Villistas oo uu hoggaaminayay Candelario Cervantes; iyo Piojo Canyon Juun 20. Bishii Nofeembar 1916, Hickam wuxuu ka tagay 7th Cavalry si uu ugu adeego Professor of Military Science ee Jaamacadda Maine wuxuuna helay dalacsiinta kabtanka Cavalry, bishii Maajo 1917, ka dib markii Mareykanka uu galay Dagaalkii Koowaad ee Adduunka. Wuxuu ku biiray 18th Cavalry bishii Luulyo, laakiin cutubkan waxaa dib loogu magacaabay qoryaha duurka.