Book excerpt: In this authoritative, in-depth account, military author and historian James F. Dunnigan uncovers the fascinating evolution of the world's deadliest warriors, from skilled prehistoric hunters, through Stoss Truppen', British SAS, Russia's Spetnaz, the Long-Range Reconnaissance Patrols of the Vietnam War, antiterrorism commandos, SWAT teams, and the commando wars of Afghanistan and Iraq. With brilliant analysis and gripping descriptions, Dunnigan explores the minds, methods and decisive battles of elite forces. This inside look shows the way warfare has changed forever.'