Medal
Silver and circular in shape. The obverse of the medal shows the crowned effigy of Queen Elizabeth II, while the reverse (shown here) bears the words 'For Accumulated Campaign Service' set within a four-part ribbon surrounded by a branch of oak leaves with laurel and olive leaves woven through the motto ribbon.
Clasp
Bears the design of laurel leaves. When the ribbon alone is worn, a silver rosette denotes award of the Clasp.
Ribbon
Purple flanked by green edges with a central narrow stripe of gold to denote excellence.
Qualifying criteria
The ACSM is awarded for 1080 days aggregated service in those theatres for which the GSM (e.g. Northern Ireland, Air Ops Iraq), an OSM (e.g. Sierra Leone or Afghanistan) or the Iraq Medal has been issued. An additional 1080 days is required for the award of the Clasp to the ACSM. More than 1 Clasp may be earned.
Separate criteria apply to Part-time members of the Ulster Defence Regiment (UDR) and Royal Irish (Home Service) Regiment.
Full details are laid out in DCI Gen 65/94 and, for the RAF, AP3392 Vol 4 Leaflet 2007 Annex B.