This calendar year has marked many great anniversaries, including the 75th anniversary of Air Training Command and the 70th anniversary of the Air Force. August marks the 110th anniversary of the Aeronautical Division of the Sign Corps—an unbroken line of Airmen began with its creation on Aug. 1, 1907. This year also marks the 100th Anniversary of America’s entry into World War I, and with it, some 43 active duty and reserve flying squadrons also celebrate or have celebrated their 100th anniversary. Their century of service reinforces something we all know implicitly—the enduring value of the squadron as the core of our Air Force.