Oak leaf cluster

oak leaf clustersOLCclusterOak LeafclustersBronze Oak Leaf Clusteroak leaves1OLC2 Oak leaf clustersBronze Oak Lef Cluster
An oak leaf cluster is a miniature bronze or silver twig of four oak leaves with three acorns on the stem that is authorized by the United States Armed Forces as a ribbon device for a specific set of decorations and awards of the Department of Defense, Department of the Army, and Department of the Air Force to denote subsequent decorations and awards.wikipedia
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Air Medal

Navy Air MedalAMAir Medals
Except for the Air Medal, unique decorations and awards issued by Department of the Army or Department of the Air Force, and those decorations and awards issued by the Department of Defense, the other uniformed services use 5⁄16 inch stars to indicate subsequent personal decorations only; a gold 5⁄16 inch star is equivalent to a bronze oak leaf cluster, while a silver 5⁄16 inch star is equivalent to a silver oak leaf cluster.
The Air Force uses the aircraft sortie designation as a tool, but uses Oak Leaf Clusters rather than Strike / Flight Numerals to indicate additional awards. A member's individual flight management records will list the sorties that are eligible for the award. These sorties are designated Combat, Combat Support, or Operational (Active Air Defense or Hostile Reconnaissance). Only the first sortie of the day counts. Armed aircraft crews require ten sorties for each award, while all others require twenty sorties.

Distinguished Service Cross (United States)

Distinguished Service CrossDistinguished Service CrossesDSC
Additional awards of the Army's Distinguished Service Cross are denoted with oak leaf clusters.

Distinguished Service Medal (U.S. Army)

Distinguished Service MedalArmy Distinguished Service MedalDistinguished Service Medals
*Additional awards of the Distinguished Service Medal are denoted by oak leaf clusters.

Air Force Cross (United States)

Air Force CrossAir Force CrossesAir Cross
Additional awards of the Air Force Cross are annotated by oak leaf clusters, and the reverse of every Air Force Cross is engraved with the recipient's name.

Silver Star

Silver Star MedalSSSilver
Second and subsequent awards of the Silver Star Medal are denoted by bronze or silver oak leaf clusters in the Army and Air Force and by gold or silver 5⁄16 inch stars in the Navy, Marine Corps, and Coast Guard.

5/16 inch star

award starGold StarGold Stars
Except for the Air Medal, unique decorations and awards issued by Department of the Army or Department of the Air Force, and those decorations and awards issued by the Department of Defense, the other uniformed services use 5⁄16 inch stars to indicate subsequent personal decorations only; a gold 5⁄16 inch star is equivalent to a bronze oak leaf cluster, while a silver 5⁄16 inch star is equivalent to a silver oak leaf cluster.
When bronze or gold stars or bronze oak leaf cluster attachments are worn in addition to a silver star or silver oak leaf attachment, the bronze or gold stars (bronze oak leaf clusters) are arranged symmetrically on the ribbon in relation to the centered silver device.

Distinguished Flying Cross (United States)

Distinguished Flying CrossDistinguished Flying CrossesDFC
Additional awards of the Distinguished Flying Cross are shown with bronze or silver Oak Leaf Clusters for the Army and Air Force, and gold and sliver 5⁄16 Inch Stars for the Navy, Marine Corps, and Coast Guard.

Purple Heart

Purple Heart MedalPurple HeartsPurple Heart Medals
A Purple Heart is awarded for the first wound suffered under conditions indicated above, but for each subsequent award an oak leaf cluster or 5/16 inch star is worn in lieu of another medal.

Soldier's Medal

SMSoldier MedalsSoldier's Medal for Heroism
Additional awards of the medal are denoted by oak leaf clusters worn on the suspension and service ribbon of the medal.

Bronze Star Medal

Bronze StarBronze StarsBSM
Oak leaf cluster – In the Army and Air Force, the oak leaf cluster is worn to denote additional awards.

Commendation Medal

Army Commendation MedalAir Force Commendation MedalJoint Service Commendation Medal
The following are examples of the first through twenty-first awards of an Army Commendation Medal with the bronze and silver oak leaf clusters:
Additional awards of the Army and Air Force Commendation Medals are denoted by bronze and silver oak leaf clusters.

Gallant Unit Citation

Air Force Gallant Unit Citation
Additional awards of the Gallant Unit Citation are denoted by oak leaf clusters.

Aerial Achievement Medal

Aerial Achievement Medal with Oak Leaf Cluster
However, if this is the case, then 26 flights must be used for the first Oak Leaf Cluster.

Meritorious Service Medal (United States)

Meritorious Service MedalMeritorious Service MedalsAir Force Meritorious Service Medal
Additional awards of the Meritorious Service Medal are denoted by bronze oak leaf clusters in the U.S. Army and U.S. Air Force, with one silver oak leaf cluster denoting five additional awards.

Defense Superior Service Medal

Superior Service MedalDef. Superior Service MedalDefense Superior Service
Subsequent awards of the Defense Superior Service Medal are denoted by oak leaf clusters worn on the suspension and service ribbons of the medal.

Legion of Merit

Commander of the Legion of MeritOfficer of the Legion of MeritLegions of Merit
Additional awards of the Legion of Merit are denoted by oak leaf clusters (in the Army and Air Force), and by 5/16 in gold stars (in the Navy, Marine Corps, and Coast Guard).

Meritorious Unit Commendation

Navy Meritorious Unit CommendationArmy Meritorious Unit CommendationMeritorious Unit Commendation Streamer
Additional awards of the Army MUC are denoted by bronze oak leaf clusters.

Achievement Medal

Army Achievement MedalAir Force Achievement MedalNavy and Marine Corps Achievement Medal
Army Achievement Medal, for additional awards - oak leaf clusters

Reserve Good Conduct Medal

Army Reserve Components Achievement MedalArmy Reserve Component Achievement MedalSelected Marine Corps Reserve Medal
Additional awards of the Air Reserve Forces Meritorious Service Medal are denoted with oak leaf clusters.

Air Force Outstanding Unit Award

AFOUAAFOUA w/ V DeviceAir Force Outstanding Unit Award with Combat "V" Device
Multiple awards of the Outstanding Unit Award are denoted by bronze oak leaf clusters, and silver oak leaf clusters, as applicable, on the ribbon.

Defense Meritorious Service Medal

Defense Meritorious ServiceJoint Service
Additional awards of the Defense Meritorious Service Medal are denoted by bronze oak leaf clusters, with a silver oak leaf cluster representing six awards.