22 SAS new recruit

That's a good question for MichaelZWilliamson, but he hasn't been on here for quite a while. If no one else chimes in, you might PM Mike or hit his website.

There are three current active regiments of the British Special Air Service. The 21, 22 and 23rd. That is what that means. BTW the US Army Delta Force qualification program were directly taken from the SAS program. I went through all of the psychological and physical qualification programs for Delta but opted out. I didn't want to be locked in to a ten year reenlistment.

Having lived and worked in Hereford, been privileged to visit both Stirling Lines and Credenhill and having met a number of members of the SAS, I believe that the term you are looking for would be either "sprog" or "crow". The latter goes way back - I think to World War I.

"sprog" is general British Army slang for a new recruit - if there's an an SAS-specific term I'm not aware of it.

And just for completeness, in case you are not in UK, sprog also means child, and "to sprog" is having a baby.