The Irregular Warfare Center’s first book, The Future Faces of Irregular Warfare:  Great Power Competition in the 21st Century, is an edited volume of essays on the future evolutions and trends of irregular warfare and competition. Written by leading scholars and practitioners of irregular warfare and national security, the book presents a forward-leaning analysis of how IW between the U.S. and its competitors is likely to play out in several key theatres, such as the Indo-Pacific and the Baltics, and in particular issue sets, such as climate change, misinformation and disinformation, economic coercion, and counterterrorism. The book serves to fill a gap in existing literature on the future trends and applications of IW—while much work has been done on attempting to define IW and show how IW trends are at play currently, less focus has been given to the evolution of IW. As such, this volume will be an important addition to the IW debate.