Embedded with writer Sebastian Junger, and shooting over the course of one year, photographer Tim Hetherington made a series of images that prove surprisingly tender in their depiction of camaraderie and vulnerability (among the most moving is a series of the platoon sleeping). Alongside revealing interviews with Hetherington's subjects and an introduction by Junger (with whom Hetherington co-directed the award-winning film Restrepo, about the work of the battalion), the book is also illustrated with graphics of the tattoos the soldiers gave each other in the camp. The title Infidel is taken from the tattoo the men adopted as a badge of their comradeship. Warm, moving and full of humor, this book is a tribute to the "rough men ready to do violence on our behalf" and a provocative contribution to the documentation of war in our time.