Rubuta ci gaba ga wannan sakin layi - Daga 1881 zuwa 1891, Gaston ya yi aiki a kan iyakar, wanda ya ƙunshi ayyukan soja da Apache da Sioux. Ya shiga cikin Yakin Spain-Amurka, yana aiki a Cuba daga 1899 zuwa 1902, kuma daga baya ya tafi Philippines. Gaston ya jagoranci sansanonin agaji na dindindin bayan girgizar kasa ta 1906 San Francisco. Ya kammala karatunsa daga Kwalejin Yaƙin Amurka a 1912, kuma tsakanin Nuwamba 1913 da Afrilu 1914, bayan ya sake tafiya zuwa Philippines tsakanin 1908 da 1910, ya umurci Makarantar Cavalry a Fort Riley. Gaston daga baya ya jagoranci rundunar sojan doki ta 6 kuma ya yi aiki a kan iyaka da Mexico da kuma Pancho Villa Expedition.
a wannan matsayin.