Regulation 13 Service in the reserve
A person transferred to the reserve in consequence of the exercise of a right conferred by regulation 11 or under regulation 12 shall serve in the reserve for a period beginning on the date of his transfer and ending—
(a)
6 years later; or
(b)
the date on which his service in the regular army would have ended if he had not exercised the right to transfer to the reserve or had his application for transfer to the reserve approved,
whichever is the sooner, or for such shorter period as the competent military authority may approve.