Scouts Out is a wide-ranging historical survey of the theory, doctrine, organization, and employment of reconnaissance units since the era of mechanization in the early 20th century. Since the early 20th century, the search for the proper mix of equipment, the proper organization, and the proper employment of reconnaissance units has bedeviled armies around the world. This survey uses a diverse variety of historical cases to illustrate the enduring issues that surround the equipping, organizing, and employment of reconnaissance units.