Is it ever appropriate to address a fellow Service Member by last name alone?

When the blackhawks came in at zero dark thirty, I'd already have 3 black coffees in quart sized plastic bottles for the acft;one for the pilots, one for the crewdogs, and one for the paxs. I rarely knew who they were, I just wrote on the bottles a message of support/encouragement, and signed each one "God Bless, Uncle Mark." Mosul, became a popular stop for weary crews. Months pass,.......coffee starts getting dropped off from anonymous donors, and a coin is left by the 1st Armored Division's commander for "Uncle Mark." Without realizing it, I had been "refueling" Squadron/Brigade/Task force commanders from time to time. Uncle Mark became the Mosul FARP's nom de plume.

Other than that, If anyone called me Mark they had better been through some serious stuff with me. Officer culture permits them to call each other by their first name, and who am I to try and change officer-isms. Those traditions make the military unique. Hearing "Merino" made my skin crawl.....hearing "Uncle Mark" made me smile. It was just an anonymous nickname.

I only ever found it appropriate when it was a peer or supervisor addressing me by my last name only. Even then, only when you know the person whose addressing you, say a person you work with or frequently associate with. A stranger should at least use your rank as well.

Per The Bluejacket's Manual (Navy version), it states that you may call a fellow service member by their last name only if they are peers or below. My hard copy of the manual is at home or I would give you the exact page number. This is a common practice that I have seen since I have been in.

If you're wounded and/ or dying on the battlefield. Feel free to call out my last name alone and I have no issue with it regardless of who you are. Otherwise, we need just stay with professional protocol and regulation

With my last name, it got shortened to "Ace" day two of basic. It stuck for the next five years. Private Ace, Specialist Ace. When I re-enlist I think I'll go warrant so I can be Chief Ace or gun for Sergeant Major Ace.
Honestly, I never minded. It was more of an alarm system, If I ever heard my full last name, it probably wasn't a good thing. Kinda like the parents calling you by your full name.

As a 1LT, I would address junior enlisted, NCOs, CWOs, and higher ranking officers by their appropriate rank followed by last name (as I would expect them to address me). The only time I would address another service member by a first name or last name only basis is if a) we are the same rank b) there are no junior enlisted, NCOs within conversation distance c) we both agree first/last name only is appropriate... usually goes without saying (but just to make sure!)

Other: With Peers and on small teams.

Normally I advocate full use of rank and name for everyone equal or junior and Sir/Ma'am for those senior. But on small teams (squads and such) in combat, last names and nicknames prevail due to tightness.

Sorry. Couldn't resist. I will go stand in the corner and think about what I have done.

As E1 - 4 didnt matter, as a NCO Never in a work enviorment. And then only if SM was the same rank, we were friends and at our home or maby fishing ECT.

What's the real question here Burns?? LOL

I have never given it a second thought when someone that outranks me calls me by my last name only. I would not let one of my Soldiers get away with it though as it is a respect thing in my opinion. Also on that note I have never had an issue with one of my Soldiers trying it. It has also been on very rare occasion that I had a superior call me by last name only.