The combat history of the 1st Battalion, 5th Marines—or “One Five” (1/5)—is long and illustrious, but there are many periods of their combat operations during the Vietnam War about which there is little in print. This history is drawn from many years of research, from the author’s personal memories, and from careful study of the battalion’s Command Chronologies and Combat After-action Reports and other historical records. Most importantly it includes a collection of true stories told to the author by dozens of U.S. Marines who served in and fought with 1/5 during the Vietnam War, at all levels of the Chain of Command. This book hunkers down with the “Mud Marines” of Charlie One Five, a small but determined band of American fighting men, and their very human and often painful stories of combat cover a wide range of scenarios and situations. Follow the Marines of 1/5 as they are lulled by the exotic and beautiful countryside, trudge through swamps, jungles, mountains, and rice paddies for seemingly endless days, and struggle to stay alert during their cautious passage through the extreme terrain and weather conditions of this incredibly scenic but deceptive land, only to be shattered by sudden and deadly attacks from Viet Cong snipers, ambushes, and command-detonated bombs. Despite the overwhelming odds against them, the Marines of Charlie One Five always emerge victorious in every battle they fight.