Ka kammala wannan jumla: A lokacin Yaƙin Duniya na II, Fuller ya shiga rundunar sojojin Amurka. An sanya shi a matsayin mai bindigar zuwa 16th Infantry Regiment, 1st Infantry Division, kuma ya ga manyan fadace-fadace. Ya shiga cikin sauka a
Afirka, Sicily, da Normandy, kuma sun ga aikin a Belgium da Czechoslovakia. A cikin 1945, ya kasance a wurin da aka 'yantar da sansanin' yan gudun hijirar Jamus a Falkenau kuma ya harbe hotunan 16-mm, wanda aka sani da "V-E +1", wanda daga baya aka haɗa shi cikin shirin Faransa mai suna "Falkenau: The Impossible" (1988). A cikin 2014, an zaɓi fim ɗin don Rajistar Fim ɗin Ƙasar Amurka. Don aikinsa na soja, an ba Fuller lambar yabo ta Azurfa, Bronze Star, Purple Heart, da kuma Alamar Sojojin Sojoji. Ya kai matsayin Corporal. Fuller ya yi amfani da abubuwan da ya fuskanta a lokacin yaƙi a matsayin kayan aiki a cikin fina-finai, musamman a cikin "The Big Red One" (1980), sunan laƙabi ga 1st Infantry Division. Bayan yakin, Fuller ya rubuta tarihin tarihin 16th Infantry.