3.—(1) A person may be enlisted in the Royal Marines for a term beginning with the date of his attestation in the Royal Marines and ending 18 years after that date or on the date of his 40th birthday, whichever is the later.
(2) Alternatively, a person may be enlisted in the Royal Marines for a term expiring on a date falling between 6 months and 17 years after the date of his attestation in the Royal Marines.
(3) The term for which a person may be enlisted may be a term wholly of service in the Royal Marines or may be a term partly of service in the Royal Marines and partly of service in the reserve.