The exact number of operatives was classified but is thought to have been between 50 and 70, with an average age of 30.
The aim was to gather intelligence on activities, certain individuals, or anything of strategic importance.
Missions undertaken by SIG required its operators to covertly infiltrate and move inside hostile territory for long periods without detection.
The SSG and the SIG merged in 2011 as Särskilda operationsgruppen (Special Operations Group, SOG).
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