This chapter focuses on defence transformations in the Czech Republic, Slovakia, and Hungary since the end of the cold war. The three lesser powers of Central Europe all eventually joined NATO and the European Union, following the fall of the Iron Curtain. The process they underwent completely transformed their security strategies and military doctrines, but the plans to transform their military forces have developed slowly, and the actual process has been interrupted and incomplete. This chapter addresses the development of civil–military relations, the main milestones in the development of the respective states’ national security policies, and the main changes in the structure of military forces in each of these countries. Finally, the chapter looks at the nascent trends towards military cooperation between the three countries, including military sharing and joint procurement.