Modern cowboys, the US Marines, ride across the vast desert in steel horses called Humvees. The first war of the 21st century is no longer house to house. It's moved mobile. After their heroic fight in Fallujah, the Berserkers, Ashmore and Sutherland are back. This time, leading a two-vehicle scout unit known as the Road Warriors, the men come face to face with IEDs, guerrilla warfare, and ambushes.