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(3) An appointment to the office of the Head of the Civil Service of the Federation shall not be made except from among Permanent Secretaries or equivalent rank in the civil service of the Federation or of a State. (4) An appointment to the office of Ambassador, High Commissioner or other Principal Representative of Nigeria abroad shall not have effect unless the appointment is confirmed by the Senate. (5) In exercising his powers of appointment under this section, the President shall have regard to the federal character of Nigeria and the need to promote national unity. (6) Any appointment made pursuant to paragraphs (a) and (e) of subsection (2) of this section shall be at the pleasure of the President and shall cease when the President ceases to hold office: Provided that where a person has been appointed from a public service of the Federation or a State, he shall be entitled to return to the public service of the Federation or of the State when the President ceases to hold office. 172. Code of Conduct A person in the public service of the Federation shall observe and conform to the Code of Conduct. 173. Protection of pension rights (1) Subject to the provisions of this Constitution, the right of a person in the public service of the Federation to receive pension or gratuity shall be regulated by law. (2) Any benefit to which a person is entitled in accordance with or under such law as is referred to in subsection (1) of this section, shall not be withheld or altered to his disadvantage except to such extent as is permissible under any law, including the Code of Conduct. (3) Pensions shall be reviewed every five years or together with any Federal civil service salary reviews, whichever is earlier. The Constitution of the Federal Republic of Nigeria Updated with the First, Second , Third and Fourth Alterations 117