General Service Medal
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The General Service Medal (GSM) was first introduced in 1918 as an Army and RAF equivalent to the Naval General Service Medal (NGSM). The medal is used in place of a specific campaign medal , for example if the campaign is not very large, clasps are added to the medal to denote the campaign.
The medal has been awarded in two forms, 1918-1962 and GSM 1962 onward.
[edit] Reference
http://www.medals.org.uk/united-kingdom/united-kingdom058.htm
http://www.mod.uk/DefenceInternet/DefenceFor/Veterans/Medals/GsmNorthernIreland.htm
http://www.stephen-stratford.co.uk/gsm_1962.htm