The medal is silver, 36mm in diameter. The obverse shows the crowned profile of Queen Elizabeth II with the inscription ELIZABETH II DEI GRATIA REGINA FID.DEF. The reverse bears an 8-pointed star with four coronets (Royal, Naval, Mural, and Astral) impaled on alternate points and a Union flag in the centre surrounded by a circlet inscribed FOR OPERATIONAL SERVICE. The ribbon has a red central stripe flanked by dark and light blue with sand-coloured edges. Image courtesy of the UK Government.