102 (b) each service of the Defence Forces, or any two or more of them jointly, are to be under the command of a separate Commander. (2) Every Commander of the Defence Forces, and every Commander of a service of the Defence Forces, is appointed by the President after consultation with the Minister responsible for the Defence Forces. (3) Commanders of the Defence Forces and Commanders of services of the Defence Forces, are appointed for a term of not more than five years, and a person must not serve in any one of those offices for more than two terms. (4) A person who has served as Commander of a service of the Defence Forces may be appointed as Commander of the Defence Forces, but a person who has served as Commander of the Defence Forces may not be appointed as Commander of a service of the Defence Forces or to the command of any other security service. (5) Every Commander of the Defence Forces, and every Commander of a service of the Defence Forces, must exercise his or her command in accordance with general written directives of policy given by the Minister responsible for the Defence Forces acting under the authority of the President. 11.12 Establishment and composition of Defence Service Commission (1) There is a Defence Service Commission consisting of a chairperson who must be the chairperson of the Civil Service Commission, and a minimum of two and a maximum of six other members, appointed by the President. (2) Members of the Defence Service Commission must be chosen for their knowledge or experience in administration, management, military affairs, their professional qualifications or their general suitability for appointment, and— (a) at least half the members must be persons who are not and have not been members of the Defence Forces; (b) at least one of them must have held senior rank in the Defence Forces for one or more periods amounting to at least five years. 11.13 Functions of Defence Service Commission (1) The Defence Service Commission has the following functions— (a) to appoint qualified and competent persons to hold posts or ranks in the Defence Forces; (b) to fix and regulate conditions of service, including salaries, allowances and other benefits, of members of the Defence Forces; (c) to ensure the general well-being and administration of the Defence Forces and their maintenance in a high state of efficiency; (d) to ensure that members of the Defence Forces comply with section 11.3; (e) to foster harmony and understanding between the Defence Forces and civilians; (f) to advise the President and the Minister on any matter relating to the Defence Forces; and