Sapper!
Excuse the BS...
It might be worth mentioning, I actually hold a valid DoD and NATO clearance from my counter explosives and NCO position in the Army. That is set through about 2014 so I shouldn't have a problem with that. I'm thinking I should have mentioned that to the OR, I'll add that to the list.
... Basically if you want a different designator then you need to talk to a different OR as previously mentioned... Good Luck!