This book is a six-decade history of the U.S. Marines. It offers insight into the corps' philosophy and military practices, explaining how technology, training, and a fiercely promoted sense of loyalty have enabled Marine perseverance through several conflicts. Because of their renowned performance in storming beaches during World War II on islands such as Guadalcanal, Tarawa, Okinawa, and, above all, Iwo Jima, the Marines are known as shock troops -- meaning they are highly spirited and aggressive soldiers trained to storm enemy defenses along a stretch of shoreline, secure a beachhead, and clear the way for heavier, conventional forces to follow. Yet they are a great deal more than that, too. The Marines are highly flexible and adaptable soldiers -- among the world's most versatile and spirited. - Publisher.