S-D, II Sqn RAF Regiment are not SF nor regarded as such. They do provide a number of officers and gunners to SFSG.
However I can reveal the real 'ard gits were 37 Sqn RAF Regiment (86-89) who kicked the collective arses of an RE Sqn in the famed Battle of the Bruggen Bop. This was part of the vicious turf war that developed when said RE Sqn were deployed permanently to Bruggen. You had to be there man!
PS We won the battle and the war and all was well.