Civil Service Personnel Rule 81
81. A service personnel shall be granted leave preparatory to retirement for four months before the date on which he attains the age specified for retirement. In timely application for the leave preparatory to retirement, if the person authorized to grant leave refuses to grant the whole or part of leave for the interests of the public, the service personnel shall be entitled to enjoy this refused period of leave starting from the date of the retirement. In such case, the period beyond the date of the retirement shall be added to and calculated in the term of service.