This book examines the continuing US commitments to NATO in the post-Cold War era. The initial focus is on the recommitment decisions of the Clinton administration. It also extensively explores the US operations in Kosovo, Afghanistan and, in particular, Libya. The case study on Libya is especially important in exploring the Obama administration understanding of the purpose of NATO in the context of current economic pressures, domestic US debates about post-War on Terror interventions, and of increasing American preoccupation with Pacific rather than European security. The author utilises substantial archival research and interviews with policymakers and academics, including Ambassador Kethleen Stephens, former Special Assistant to the President Stephen J. Flanagan, and former Director for Non-proliferation at National Security Council Robert S. Litwak. This book is ideal for postgraduate researchers and academics in US foreign policy, foreign policy decision-making, transatlantic relations and NATO, as well as a great use to undergraduate students.