John A. Nagl, Project Director Katie Crombe, Chief of Staff The Russia-Ukraine War represents a strategic inflection point that provides valuable insights into the future of war and how the US military must adapt. This book identifies the US Army’s current weaknesses and the lessons it must learn from the Russia-Ukraine War as the service reexamines all aspects of its composition to prepare for future conflicts. Keywords: Russia-Ukraine War, multidomain operations, convergence, combined arms, reconstitution, large-scale combat operations, sustainment, security assistance, personnel depth, mission command, allies, UAS, AI, OSSINT, command post, strategic inflection point Ukraine flag painting used on cover and background image from Freepik (https://www.freepik.com/free-vector/hand-painted-watercolour-ukraine-flag-background_25033790.htm) and the tank from Unsplash (https://unsplash.com/photos/a-large-rusted-out-tank-sitting-on-the-side-of-a-road-SxFGG1cIOw0)