Recent disputes with other members of the North Atlantic Treaty Organization (NATO), engagement with Russia, and domestic democratic-backsliding call into question the value Turkey brings to the NATO alliance. In this article, Mr. Paul J. David-Justus examines the history of Turkey’s membership in NATO, the challenges Turkish domestic and foreign policy pose to the alliance’s objectives, the advantages and liabilities it brings to the alliance, and the options regarding the future of Turkey’s role in NATO.