With the United States increasingly relying on immigrant labor to sustain its global military presence, thousands of noncitizen immigrants serve in the U.S. armed forces each year. These individuals occupy a contradictory position: lauded as model immigrants for their patriotism and sacrifice yet simultaneously regarded as potential security threats. While existing scholarship has explored immigrant incorporation through labor markets or pathways to citizenship, less attention has been paid to military service as a site where citizenship is negotiated, constrained, and militarized. Sofya Aptekar’s Green Card Soldier: Between Model Immigrant and Security Threat centers the intersecting roles of U.S. military and immigration systems, arguing that noncitizen enlistees, whom she terms “green card soldiers,” navigate a dual position—as strategic actors making choices under constraint, and as agents of a U.S. imperial project that deploys foreign-born labor to sustain its global reach. In doing so, Aptekar sheds light on this overlooked population, exposing the uneasy relationship between immigrant enlistment, national belonging, and U.S. empire.