This book is a thorough treatment of the evolution of the United States Marine Corps's principal distinguishing insignia, and covers from 1804 through World War I. The large inventory offers an objective basis for the identification, classification, and dating of over 300 emblems. The reader will find answers to questions about individual emblems such as: What is it, and what was its function? What is most significant, including its historical context? When was it used and discontinued, and if possible to answer, who manufactured it? Also, included are answers to the most important question: What are the sources supporting these interpretations? A comprehensive guide is needed for the identification of US Marine Corps emblems, especially considering the serious proliferation of fakes and reproductions. This is a valuable tool for one of the fastest-growing military collectibles in the world.