The Operational Service Medal was established in 1999 to replace the General Service Medal for all new operations. A separate medal of the same design is awarded for each campaign, differentiated by a distinct ribbon. It has been awarded for four separate campaigns:
From 2008, British service personnel could receive the General Service Medal for participation in smaller operations that do not justify the award of the Operational Service Medal.
Medal
The Operational Service Medal for Sierra Leone is silver and circular in shape. The obverse shows the crowned effigy of Queen Elizabeth II with the inscription ELIZABETH II DEI GRATIA REGINA FID. DEF. The reverse bears the Union Flag, surrounded by the inscription FOR OPERATIONAL SERVICE and the four major points of the compass with, between the points, four Coronets: Royal, Naval, Mural, and Astral.
Clasp
No clasp was issued. A large South Atlantic Medal type silver rosette is worn on the medal for operational service within Sierra Leone during Operations Maidenly and Barras. A smaller rosette is worn on the ribbon bar.
Ribbon
The ribbon consists of a broad central red stripe, flanked each side by a stripe of navy blue and one of light blue, to represent the three services, with an outer stripe of green to reflect the jungle landscape of Sierra Leone.
Qualifying criteria
The length of service to qualify for the medal is determined by the mission participated in:
1 day of service on Operations Barras or Maidenley
30 days continuous or accumulated service on Operations Basillica or Silkman
The precise dates of each operation varied, but all were within the period 5 May 2000 to 31 July 2002. The medal was also awarded for service in the wider Joint Operational Area which included Senegal, Gibraltar and offshore support ships such as RFA Argus. There is no minimum qualifying period for those decorated for operational service, while the period could be reduced for those killed or wounded on operations. Qualifying service for the Operational Service Medal counts towards the period required to receive the Accumulated Campaign Service Medal. British forces serving with United Nations peace keeping missions in Sierra Leone did not qualify for the Operational Service Medal, but instead received the United Nations Medal with the ribbon for either UNOMSIL or UNAMSIL.