All original appointments to any position on the police force or paid personnel for the Fire Department shall be for a probationary period of one year. During the period of probation, the appointee shall attend school and training sessions and take examinations as required by law for certification for the position appointed. If, at the close of the probationary period, the appointee has not satisfactorily completed the training and schooling and successfully passed the required tests which are required by law for certification, the borough administration shall so advise the appointee, and the appointment shall cease. However, in certain cases where the Director of Public Safety deems it appropriate and a new appointee during the probationary period fails to complete his/her training or obtain appropriate certification, the Director of Public Safety may extend the probationary period for an additional year. Such extension of the probationary period shall be in writing, and no person shall be in a probationary status in excess of two years. If the person successfully completes all schools, training and/or certifications as required by law, then that person shall be retained as a permanent appointment for the position hired.