Originally Posted by Wikipedia
...The rosette remains an unusual feature for a British medal and was used in this case because otherwise fewer than two hundred medals would have been issued to the Royal Air Force. The vast majority of the medals were issued with a rosette whereas over 90% of the medals issued to the Royal Air Force are without the rosette and thus rarer, the recipients having been stationed on Ascension Island, some 3,300 nmi (6,100 km) north of the Falkland Islands and the war zone...