Rule 21 applies only during service. Retired government servants are free to marry without permission. However, post-retirement employees (re-employed on contract) are typically still governed by conduct rules during their re-employment tenure.
Source: CCS-CONDUCT Rule 32
When must the Annual Property Return be filed?
Can service associations organise peaceful marches to submit memorandums?
Can a government servant lose their job solely because they married without permission?
What permission is needed to sell ancestral property?
Can a government servant marry a foreign national?
This answer is for informational purposes only and does not constitute legal advice. Always refer to the original rules and consult competent authorities for official interpretation.