This year marks the 100th Anniversary of America's entry into World War I, and with it, some 43 active duty and reserve flying squadrons are celebrating their 100th anniversary. Their century of service reinforces something we all know — the enduring value of the squadron as the core of our Air Force. The basic Air Force aerial framework at the squadron level has changed very little. The essential fabric of a squadron commander, first sergeant and the arrayed staff and flight teams are largely the same. Learn about the history of the Air Force squadron on the U.S. Air Force website. For more World War I and other historical articles, visit the Military.com History Center.