Kammala wannan jumla: Bayan iyakar, McClure ya kasance a Puerto Rico daga 1899 zuwa 1900, sa'an nan kuma ya yi aiki a Philippines daga 1901 zuwa 1903. McClure ya zama babban digiri na Makarantar Layi a shekara ta 1909, kuma ya sauke karatu daga Kwalejin Sojojin Sojojin a 1910. Ya zama mai koyarwa a Makarantar Sabis na Soja daga 1913 zuwa 1916. A lokacin bazara na 1916, ya shiga cikin
Tafiya ta Pancho Villa. A shekara ta 1917, McClure ya sauke karatu daga Kwalejin War War na Amurka kuma an inganta shi zuwa Brigadier Janar a ranar 17 ga watan Disamba na wannan shekarar. Ya kasance kwamandan sansanin sansanin na farko a San Nazaire, Faransa, har zuwa 1918. McClure ya zama kwamandan Brigade na 69 na watanni biyu, sannan ya umurci Rundunar Sojoji ta 38 na makonni biyar. McClure ya shafe watanni uku a cikin fada tare da duka rukuni na 69 da na 38. McClure ya yi aiki a ofishin Shugaban Ma'aikata a Washington daga ƙarshen 1918 zuwa farkon 1919. Daga 1920 zuwa 1922, ya yi aiki a matsayin mataimakin kwamandan Kwamandan Kasuwanci a Fort Leavenworth, Kansas kuma daga 1923 zuwa 1926 ya yi aiki tare da Signal Corps. McClure ya yi ritaya a matsayin colonel Yuli 21, 1929, kuma an sake mayar da shi Janar Janar a Yuni 1930.