60Release from service under call-out order
(1)A person who has been accepted into service under a call-out order shall remain in that service until released under subsection (2).
(2)A person who is in service under a call-out order shall be released from that service with all convenient speed in such manner as may be prescribed when he is no longer required by Her Majesty to be in that service or (if not released sooner)—
(a)when he becomes entitled to be released by virtue of section 53, 55 or 57, as the case may be;
(b)when an order revoking that call-out order is made; or
(c)when, on an application under section 78, it is determined that he is entitled to be released.
(3)Orders or regulations under section 4 may make provision enabling or requiring a person who has been accepted into service under a call-out order to be treated—
(a)if the circumstances of his call out or acceptance into service are of a prescribed description, and
(b)for the purpose of calculating when he is entitled to be released by virtue of section 53, 55 or 57,
as having been accepted into service on an earlier day than that on which he was actually accepted.
(4)Provision made for the purposes of subsection (3) shall secure—
(a)that any earlier day applicable for the purpose of calculating when a person is entitled to be released from service is to be notified to him as soon as is practicable after the day on which he was actually accepted into service; and
(b)that the period beginning with the earlier day is reckoned as part of his relevant service for the purposes of section 53(13), 55(13), 57(11) and 69(8).