Kammala jumla mai zuwa: Holbrook ya kasance a Schofield Barracks, Hawaii har zuwa Afrilu 4, 1916 sannan ya kasance Quartermaster a Fort Riley, har zuwa Yuli 1916. A shekara ta 1916, ya yi aiki tare da Janar John J. Pershing
Sojojin Bincike na Mexico, a matsayin kwamandan masu yin burodi. Wannan shine farkon amfani da tanda na soja, wanda ya ƙirƙira.