U.S. defense planning has evolved since the mid 1970s, with the end of the Vietnam War and the founding of the All-Volunteer Force (AVF). Since then, at least four troubling myths have become baked into doctrine, strategy, and force planning processes. These beliefs focus on our strengths, but have in some ways blinded us to the enduring nature of conflict. They have hindered our ability to institutionalize lessons from our most frustrating operational experiences in favor of constructs like the Revolution in Military Affairs (RMA), “rapid, decisive, operations” and (most recently) AirSea Battle. As the Pentagon grapples with diminishing resources and an accelerating technology curve, it is worth reflecting on these myths and how we can overcome them.