Except as otherwise provided in paragraphs (2) and (3) of this subsection, a police employee who resigns from the Department for any reason may not be reappointed. A police employee who resigns to enter the uniformed services may be reappointed. By rule, the Secretary may reappoint a police employee who resigned in good standing if the individual meets the requirements then applicable for initial appointment. An individual may not be reappointed to a rank higher than the rank that the individual previously held as a police employee. An employee who is terminated from the Department may not be reappointed.