The service will begin at 11am in Hermitage Park, by Rev. David Clark.
Naval Base Commodore Keith Beckett, the Vice Lord Leitenant Gill Aitkenhead and Councillor Maurice Corry will be attending.
There will also be a display, organised by Irene White from RBL, in Helensburgh Library from Monday onwards with photos and postcards of medals and memorabilia.
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