Book excerpt: The purpose of this book is to provide a military reference source concentrating primarily on U.S. Army designs where most shoulder sleeve insignia originated. However, we have incorporated some of the most popular U.S. Navy and U.S. Marine Corps designs that will be encountered. Keep in mind that in 1947 with the advent of the realignment of the armed services, several major changes occurred. The U.S. Air Force was created and separated from Army control to become an independent entity and the U.S. Marine Corps ceased wearing patches on uniforms. Also includes a section of "Unofficially Authorized" patches prevalent in the U.S. Marine Corps.