[El_Phil]

First off there are loads of acronyms that aren't gone. Just of the top of my head 'Imperial Security Force' which not even acronymfinder can find something wrong with.

Next take if you will M.I.5 here in the UK. It isn't and never has been called M.I.5 and is in fact called The Security Service, hence SS as the short form. This is unacceptable so its M.I.5. Also how often is the yank Secret Service shortened to SS? nope its the United States Secret Service, so you get USSS.

In short while you may not have a problem with it lots of other people might. If you ever want to get anything published that's something you'll have to get used to.

Finally have you forgotten just a couple of months back the fuss on this very forum? Rest assured that using SS and SD will cause offence to someone and they will be vocal about it. You have no excuse not to pick a different acronym, so someone will read way too much into it. And as Mephisto points out some countries laws take a dim view of such things.