Kammala wannan jumla: Dvorak ya yi aiki tare da sojojin Amurka na Artillery
a lokacin da ake azabtar da shi a kan Pancho Villa kuma ya ji rauni a lokacin yakin. Bayan haka an sallame shi kuma ya shiga cikin Rundunar Sojan Ruwa ta Amurka, yana koyar da lissafi da kewayawa har zuwa Yaƙin Duniya na ɗaya, lokacin da ya yi aiki a kan jirgin ruwan Amurka na Amurka "Callao" wanda aka kama a Jamus wanda ya kawo sojoji gida har zuwa lokacin da aka sallame shi a shekarar 1919. Daga baya, ya kasance kyaftin din jirgin ruwa na "Gato" a cikin Sojojin Ruwa na Amurka a lokacin Yaƙin Duniya na II. Yayin da ake furta sunansa ), tare da "ř" kusan a matsayin mai sau uku a lokaci guda kuma saboda shi dan asalin Czech ne, dangin Dvorak a Amurka suna furta shi, tare da "r" Ingilishi.