A new and provocative take on the formerly classified history of accelerating superpower military competition in space in the late Cold War and beyond. In March 1983, President Ronald Reagan shocked the world when he established the Strategic Defense Initiative (SDI), derisively known as “Star Wars,” a space-based missile defense program that aimed to protect the US from nuclear attack. In Weapons in Space, Aaron Bateman draws from recently declassified American, European, and Soviet documents to give an insightful account of SDI, situating it within a new phase in the militarization of space after the superpower détente fell apart in the 1970s. In doing so, Bateman reveals the largely secret role of military space technologies in late–Cold War US defense strategy and foreign relations.