The Buzz Number system, the famous identification system for U.S. Army and U.S. Air Force aircraft from late 1945 into the mid-1960s, was developed as a deterrent to 8th Air Force pilots engaged in unauthorized low-level flying over post-war Europe. This practice, called 'buzzing', prompted the need for ground observers to be able to identify and report a particular offending aircraft. In response to this need, a system of letters and numbers was developed to uniquely identify each aircraft in inventory. This book includes an in-depth explanation of the buzz number system as well as its many applications.