Are you familiar with English Language at all. I have BA in Linguistics and I can tell you with full authority that
Do you have any language degree or masters in lexicography? If not, learn not to talk without knowledge. I can tell you categorically that 'retd' is a dictionary entry in the dictionary:
Oxford Dictionary
retd
(also ret.)
- Retired (used after the name of a retired armed forces officer or in recording that a sports player retired from a game)
‘Capt. Edwin Richards, RN (retd)’
‘the side were given a sound start by opener Edwards (31 retd)
retd
retd is a
written abbreviation for
retired. It is used after someone's
name to
indicatethat they have retired from the
army,
navy, or
air force.
...Commander J. R. Simpson, RN (retd).
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers