This article explores the neglected connection between race and militarism by focusing on a US missile defense system deployed in South Korea. In September of 2017, the two countries installed the Terminal High Altitude Area Defense system in a rural village. Manufactured by Lockheed Martin, this missile defense system was to protect South Korea from attacks by North Korea. The system is integral to US global military strategy, but from the perspective of human security, its benefits are dubious at best. By drawing on a theory of the ‘racial state’ and critical studies of the US empire-state, the article examines two fundamental practices of the neocolonial military relation between the two states: wartime Operational Control of the South Korean military and extraterritoriality of US bases in South Korea. It argues that these neocolonial practices in which the Terminal High Altitude Area Defense system deployment is embedded reflect ‘the historicist racial ruling’ that denies self-rule for Koreans and its internalization by Koreans who support the unequal military relation. It also analyzes how the South Korean racial state promotes internal homogeneity and otherizes North Korea to bolster national security through the missile defense system.