Cika wannan jumla: A cikin yakin da Spain a 1898 da yawa Citadel tsofaffin ɗalibai sa kai ga sabis fiye da ake bukata. A cikin yakin duniya na farko, masu digiri na Citadel sun kasance daga cikin rukunin farko na sojojin Amurka don yin yaƙi da Australiya, kuma daga baya Birtaniya da Faransa.
Yaƙin Belleau Wood. An canza sunan kwalejin a hukumance a cikin 1910 zuwa "The Citadel, The Military College of South Carolina"; kalmar "Academy" ta zama daidai da makarantu na sakandare kuma jama'a suna da kuskuren cewa Kwalejin Soja ta Kudancin Carolina makarantar shiri ce. A wannan lokacin makarantar ta wuce wurinsa duk da ƙari da yawa, a cikin 1918 garin Charleston ya ba da jihar South Carolina a bakin Kogin Ashley don sabon harabar a kan yanayin da jihar ta ba da kuɗin ginin. Jihar ta yarda da tayin a ranar 26 ga Fabrairu, 1919 kuma ta ba da dala 300,000 don gina sabon harabar. A cikin 1921 an canza taken shugaban makarantar daga Superintendent zuwa Shugaba, Kanar Oliver J. Bond shi ne Superintendent na ƙarshe kuma Shugaban farko na The Citadel.