What did we learn about modern war in 2021? What issues defined the most important conversations in defense circles? In this special year-end episode of the MWI Podcast, John Amble speaks to the directors of MWI's four themed projects, each aimed at advancing our understanding of a particular aspect of modern war—the Urban Warfare Project, the Irregular Warfare Initiative, Project 6633, and Shield Notes—along with one of the curators of the Full Spectrum series of articles on cyber and information operations that we published this year. They explain the events that were most significant in the past year, the topics that garnered the most attention, and what they expect for 2022.