51.—(1) The following—

(a) the appointment of a person to be an officer of the Permanent Defence Force or the Reserve Defence Force,

(b) the retirement, under subsection (2) or (3) of section 47, of an officer of the Permanent Defence Force,

(c) the relinquishment of his commission, under subsection (2) or (3) of section 48, by an officer of the Reserve Defence Force,

(d) the resignation by an officer of his commission,

(e) the dismissal of an officer under section 50,

shall, in each case, take effect from such date as the President may fix.

(2) The retirement under subsection (6) of section 47 of an officer of the Permanent Defence Force shall take effect from such date as the Minister may fix.

(3) The following—

(a) the promotion of an officer to higher substantive or acting commissioned rank,

(b) the reversion of an officer holding acting commissioned rank to his substantive commissioned rank or to acting commissioned rank higher than his substantive commissioned rank,

shall take effect as from such date as the Minister may fix.