Former Army Ranger and Air Force Pararescueman Wil Willis presents the evolution of military firearms and how the development of each one has changed the face of combat. With exclusive access to top firearms collections, Willis - who teaches Tactical Combat Casualty Care to deploying military units - thoroughly examines, tests, critiques and fires each weapon. In each episode, Willis is joined by historical and technical experts who provide personal insight on the weapon and what makes it unique or separates it from competitors in its class.