According to the 1957 edition of 'Ribbons and Medals' by Taprell Dorling, the colours signify the following:
'The ribbon is flame coloured, with green edges and a narrow black stripe in each green edge. The colours symbolise the enemy attacks upon our green and pleasant land, and the black represents the black-out all over the country.'
Service to qualify for the award counted from 3 Sept 1939 to 8 May 1945. The following categories - amongst others - were eligible:
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