John Beauchamp, of Lime Kiln, Wootton Bassett, will be presented to the Queen after a British Korean Veterans' Association parade in London.
The parade, on 9 July, commemorates the 50th anniversary of the ceasefire between North and South Korea.
Mr Beauchamp is the standard bearer for the Swindon branch.
He and branch secretary Jack Howard, of Longleat Gardens, Swindon, will be presented to the Queen at a reception following a commemorative thanksgiving service at Westminster Abbey.
The day will begin with a ceremonial March Past on Horse Guards Parade, where the Duke of Edinburgh will take the salute.
The Swindon branch contingent will also include Albert Davey, of Wootton Bassett, who lost a brother in the Korean War.
Mr Beauchamp said: "Although this year is the 50th anniversary of the signing of the ceasefire, to this day no peace treaty has been signed by the two countries. Veterans will now be between 70 and 80 This will probably be the last national gathering of the BKVA.
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