21Duration of Air Force Reserve permanent service
(1)Subject to this section and section 13(3) above, a man of the Air Force Reserve when called out for permanent service shall be liable to serve until Her Majesty no longer requires his services.
(2)No man called out for permanent service shall be required to serve for a period exceeding in the whole the remainder unexpired of his term of service in the Air Force Reserve, subject to section 69 below.
(3)Sections 9 and 13 of the [1955 c. 19.] Air Force Act 1955, so far as they relate to discharge, shall apply to men of the Air Force Reserve called out for permanent service as they apply to airmen of the regular air force, and nothing in subsection (2) above and section 69 shall prejudice the operation of sections 9 and 13 as applied by this subsection.