|  | Air Force Longevity Service Ribbon Award  Authorized by the Secretary of the Air Force, November 
              25, 1947. Air Force Longevity Service Ribbon is awarded to all Service members of the U.S. Air Force who 
            complete four years of honorable active or Reserve military service.   Subsequent 
            periods of military service shall be denoted by an oak-leaf cluster worn on the service 
          ribbon. 
 Authorized Devices: Bronze Oak Leaf, Silver Oak Leaf
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