Anyone know what Army Regulation (or any branch) that allows a higher-ranking officer to call a lower-ranking officers by their first name?

What was the occasion/situation; do you work in the Medical field; or was it conversation you overheard? Maybe they're cousins, siblings, in-laws; or two individuals discussing what they're going to do when they ETS/Retire. The way you have posted this query provides insufficient evidence to determine a definitive answer.

Please rephrase the question, providing the circumstances surrounding the "event" and resubmit the question.

Air Force does!

It actually is in a regulation. I can't remem which one but I looked it up once and found it. It started something along the lines that seniors were allowed to address their subordinates by their first names. SB: not being facetious

Seems to be strictly an officer thing and in my opinion it sets a bad example in all ranks.

As CW4 you know this depends in culture, postion and such. A Colonel should never address a 2nd lt by their 1st name. But a major and a captain that have known each other for some time and in a informal setting would be different

The Navy does it all the time while at sea. Now I was in the HSL community so we’re were on dets and it was about 15 or us out to sea at one time for deployment. I can’t speak for full squadrons

Strickly speaking we don't have to address anyone by their last name, it's an anachronism from the Victorian era that the military retained. Frankly no one cares if you address them by thrir first name even if they're sticklers for D&C. Fact is that it's one of those things everyone does simply because everyone does it. We all call people by their first names out of uniform, so get a few random people's attention by using their first name and you'll see what I mean.

I've gotta admit, that:s interestingly phrases, on a humorous level, please understand, for me, in any event, it was a case of basically even needing to put up with "Hey you", sometimes (joke), lol, basically, though, they pretty much aoo called me by my first name, quite honestly, after awhile, it was normal for me. One amusing thuinh that really did happen once, another Lt in my unit, he was a USAFA grad, he worked a good deal with one of the enlisted techs, they were apparently also good friends, so the Lt, whim I knew, though not as well, knew what he could get away with. He enlisted, I think he was SrA, as I recall, he was somewhat heavyset, though apparently within the norms for te period, evidently. Anyway, one day, as I was walking down the halo of my unit, I passed the other Lt, we said hi, ephem, amazingly, he basically helped out to his friend, the SrA tech, and I swear, this is word for word, honest...'YO, FAT ONE!!!!!"

I gotta tell ya, guys, my freaking jaw just dropped open, hung there swinging crashing right against the floor, I swear, it:s all true, verbatim..he other Lt also had this snazzy little sports car convertible he'd drive around on the installation, some kind of Porsche, I think, I'd often see him and his friend the SrA tech in it if they were out getting something to eat...I guess the SrA took it on a good note, with humor...to this day,, though, honestly, I still fi d it strains even my credulity recounting that story to people, you know?

I'm telling UA, guys, sometimes, weirdo things like that really do happen, been there, done that (BTDT), lol....

22-5

I think it an Air Force regulation..... they are after all smarter and a corporation culture