Full history and eligibility can be found here

As this is a peacekeeping rather than campaign medal

Prior to this change

The General Service Medal 1962 - 2007 is commonly known as the Campaign Service Medal 1962 as was awarded with a minimum of one campaign clasp (in the instance 'Air Operations Iraq') and it is believed that a maximum of six clasp have been awarded on one medal

This example features the original style suspension as issued although many recipients changed them to ornate silver suspesnions

OSM Sierra Leone Miniature Medal with Rosette FS Mount & Engrave Full history and eligibility canOperational Service Sierra Leone. Awarded for service from 2000 in Sierra Leone. Those who took part in Operations Barras and Maidenly were granted a silver rosette to be worn on the ribbon of the medal.