Jewish volunteers who served France faced systematic discrimination through forced assignment to the French Foreign Legion during both World Wars, despite their patriotic motivations and willingness to fight in regular army units. Thousands of Eastern European Jews eagerly enlisted during WWI through organized recruitment centers, inspired by France's historic role as the first nation to grant Jews civil rights. Yet their treatment revealed a stark contradiction between France's democratic ideals and military practices. Drawing from recruitment records, personal testimonies, contemporary press accounts, and the author's own service in the 12th Regiment during WWII, this research documents patterns of prejudice and mistreatment across both conflicts. Jewish legionnaires encountered ridicule from professional soldiers, anti-Semitic officers, inferior equipment, and particularly dangerous assignments. The devastating Battle of Carency in 1915, where approximately 3,100 of 4,000 Jewish volunteers perished, sparked protests and government investigations. During WWII, Jewish refugees again found themselves channeled into Foreign Legion units, facing similar discrimination. Most tragically, many WWII Jewish veterans were later interned in labor camps and deported to concentration camps, despite their military service. While France officially justified these assignments through traditional policies regarding foreign volunteers, the evidence reveals how institutional practices resulted in systematic discrimination that ultimately betrayed both individual Jewish soldiers and France's democratic principles.