NIM32004 - Special Cases: Class 1 - HM Forces:
Exclusions
Schedule 6; Part 2 SSCR 2001
Any naval force of HM Forces who locally
entered the force at an overseas base and who had not been
registered for NI before they joined the force
Any military force of HM Forces who entered the
force or was recruited outside the UK and the depot of the unit is
outside the UK
The airforce of HM Forces who entered that
force outside or was recruited outside the UK and is liable to
serve only in a specified part of the world outside the UK