In considering the question “How will we fight?”, this article begins by examining the threats we face from conventional, insurgent, and hybrid enemies as well as terrorists and super-empowered individuals. It then outlines how America can fight effectively against each threat—as well as identifying the deficiencies in our current force structure that will hinder that response. The analysis argues that America needs a well-balanced, medium-weight joint force. It then provides recommendations for each of the services, as well as special operations forces, to achieve that goal. It concludes by describing what is needed to insure our force is capable of the rapid innovation in wartime required of successful nations.