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Amedal bar ormedal clasp is a thin metal bar attached to the ribbon of amilitary decoration,civil decoration, or othermedal. It most commonly indicates thecampaign oroperation the recipient received the award for, and multiple bars on the same medal are used to indicate that the recipient has met the criteria for receiving the medal in multipletheatres.

When used in conjunction with decorations for exceptional service, such as gallantry medals, the term "and bar" means that the award has been bestowed multiple times. In the example, "Group CaptainLeonard Cheshire,VC,OM,DSO and two bars,DFC", "DSO and two bars" means that the Distinguished Service Order was awarded on three occasions. A British convention is to indicate bars by the use of asterisks; thus, DSO** would denote a DSO and two bars.

Bars are also used on long-service medals to indicate the length of service rendered.

The two terms are used because terms "bar" and "clasp" both refer to two parts of the medal; the indicator discussed in this article, and the part of the medal connected to the ribbon.

Prior to the early 19th century, medals and decorations were only awarded toranking officers; occasions existed where medals were presented to soldiers (other ranks orenlisted men) or seamen (naval ratings), but these were often private efforts. One exception was theArmy Gold Medal issued to higher ranking participants in thePeninsular War. A medal was given for service, with a clasp for each battle fought. After four clasps were earned the medal was turned in for a cross with the battle names on the arms, and additional clasps were then added. The maximum was achieved by theDuke of Wellington, with a cross and nine clasps.

Over the next 40 years, it became customary for governments to present a medal to all soldiers and officers involved in a campaign. These medals were often engraved with the names of the major battles the recipient had fought in during the campaign. The main disadvantages of this system were that new medals had to be created for each campaign or war, and that it was impossible to tell at a glance if the recipient was only a participant in the campaign overall, or if he had been involved in one or several major actions. (The first gallantry medal to be awarded to ordinary British soldiers was theVictoria Cross in 1856.)

TheSutlej Medal was the earliest medal to use such bars. It was awarded toBritish Army andHonourable East India Company soldiers who fought in theFirst Anglo-Sikh War between 1845 and 1846. The first battle the recipient participated in would be engraved on the medal itself. If the recipient had participated in multiple engagements, silver bars bearing the name of each additional battle were attached to the medal's ribbon. This method of notation evolved again on thePunjab Campaign medal, where the standard medal was awarded to all that had served during the campaign, with bars produced for the three major battles; theBattle of Chillianwala, theSiege of Multan, and theBattle of Gujarat.

The creation of bars led to the development of 'General Service' medals, which would be presented to any soldier serving in a general region or time frame. Bars would be awarded to denote the particular campaign or war the recipient fought in. The 1854India General Service Medal was awarded to soldiers over a 41-year period. Twenty-three clasps were created for this award, becoming one of the more extreme uses of this system. The BritishNaval General Service Medal, was authorised in 1847 with some 231 clasps (of which about 10 were never issued) for actions ranging from relatively minor skirmishes to certain campaigns and all full-fledged battles between 1793 and 1840.

TheCrimea Medal was issued with ornate battle bars. Since then the general trend has been to have simple horizontal devices.

• Campaign bars orbattle bars are used to denote the particular campaign, battle, or region the recipient operated in to receive the award. This is the most common use of medal bars on military decorations. In the United Kingdom, campaign bars are usually known as clasps and when the ribbon alone is worn they are sometimes indicated byrosettes, although this is not commonly authorised. Examples of ones that were issued are the "under enemy fire" clasp on the1914 Star and theBattle of Britain clasp on the1939-45 Star. In theUnited States Military,Service stars are used to indicate participation in multiple battles or campaigns, although theWorld War I Victory Medal had an extensive system of bars. Starting withWorld War II theArrowhead device was authorized for assault landings. Also in this conflict a unique variation of the Service star was theWake Island Device, a "W" placed on the ribbons of the Navy and Marine CorpsExpeditionary Medals. This was issued to represent the medal bar for fighting in theBattle of Wake Island.
• Achievement bars are used to indicate a particular or additional feat associated with the medal. As an example, theWintered Over Device attached to the United StatesAntarctica Service Medal indicates that the recipient performed atour of duty during the Antarctic winter.
• Service bars indicate the length of service a person has provided to the organisation presenting the award. This type of bar is most commonly found on long service medals for the military andemergency services.
• Multiple award bars display the number of times a decoration for merit or distinguished service has been awarded. In the United States, Oak Leaf Clusters (Army and Air Force) and Stars (Navy and Marine Corps), rather than bars, are issued for receiving the same award multiple times. In the United Kingdom, each bar is indicated by a rosette when the ribbon alone is worn (or, in the case of theVictoria Cross orGeorge Cross, by an additional miniature model of the cross itself, since one of these is always worn on the ribbon of these two awards).

• Dorling, Henry Taprell (1974).Ribbons and medals: the world's military and civil awards (New Enlarged (11th) ed.). Suffolk, England: W.S. Cowell Ltd.ISBN 0-540-07120-X.

• Medals

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