What would you like to do?
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The common abbreviation used for "about" is "abt." but there is no abbreviation for "on" as it is too short to need one.
Col "Name" (RET) for Air Force and Marine Corps, COL "Name" (RET) for Army.
ret. or Ret.
PPL is the abbreviation or 'IM' for people
I think it is Lt Col (ret). Verify to be sure.
Retire is not an abbreviation, unless you are using it in a specific way
C - Correction / | Abbreviation:C / Definition:Correction - also CORR and COR / Definition Rank: / Unconfirmed Type:Acronym or Initialism
The abbreviation would be I've.