[Mr Rogers]

I'm still active duty after 21 - I've never cared diddly squat about rank abbreviations. If I'm writing an OPR or a medal citation - yes. But a memo was just a memo, and emails are just emails...what I use varies from day to day.

I could easily imagine a TANG LTC (or Lt Col, or LtC, or some other variation) using a non-standard format.

On the other hand, in the early 80s when I was in my first fighter squadron, no one TYPED an unofficial memo. Much faster to write it by hand. But that just may have been in that squadron...

[pabianice]

I'm still active duty after 21 - I've never cared diddly squat about rank abbreviations. If I'm writing an OPR or a medal citation - yes. But a memo was just a memo, and emails are just emails...what I use varies from day to day. I could easily imagine a TANG LTC (or Lt Col, or LtC, or some other variation) using a non-standard format.

That makes one of you. In 21 years in the Navy I never saw any official document with an incorrect abbreviation of rank. Mistakes were destroyed and started over again. A senior officer using an incorrect rank abbreviation never happened.