5(1)A person is within this paragraph (subject to paragraph 11) if—
(a)he is employed by or in the service of a specified naval, military or air-force organisation of which the United Kingdom is a member;
(b)he is so employed by reason of the United Kingdom’s membership of that organisation; and
(c)he is outside the British Islands.
(2)In this paragraph “specified” means specified by order of the Secretary of State under this paragraph.