Similar to the E-2 question, how would you react to a young 2LT who is being unprofessional with a strong sense of entitlement?

Okay, I have to do this from my point of view (that of an E5 and in the army). This is exactly how this gets handled:
1. Approach and get his attention and tactfully, keyword, inform the young 2LT that he is not supposed to be wearing a headset under those circumstances.
2. He cops an attitude.
3. Politely remind the LT that though he is an officer that all of the regs apply to him and he should be presenting himself better due to the fact that he is an officer.
4. If he corrects himself at this point, mission complete, thank him and leave. If not and the attitude persists, he then gets treated like any other little piece of shit.
5. Take down the punks name and unit, report his dumbass to his own chain of command, and they can deal with it.

I've never known of a COC that didn't respect the word of an NCO if an issue was brought up to them. Usually, shit gets hashed out. The key is to not lose your cool during the encounter. And when you leave the situation don't let it big you anymore. There are tons of little punks in the military, can't get angry at that all or you'll have a heart attack... Or a mental breakdown lol

I would inform him that Army Regulations applies to all that serve in this branch and that if need I would refer him to the regulation that addresses the proper wear of his uniform, what was acceptable and unacceptable.

Same issue here as the younger generation not respecting their elders for the fact of simple respect. Is politeness enough to get mutual respect? Is a chewing out going to resolve the issue? It is more than that, it is a general generation of entitlement. This is not a suit all situation comment, it is more if a sense of the everyone gets a trophy generation coming home to roost comment. To the point, I ignored people that didn't give return respect, they are not worth trying to save at the expense of an argument or threat today of physical harm. My two cents...

FIRST.....You can be sure this "pseudo-God complex" is reflected everywhere.... his military career will not be a long one. SECOND Personally I would not bother taking any further action but if you want to take additional action ....that action would depend on your rank.... as a subordinate there is not much you can do except report him to his command ( name rank and patch should suffice in locating his unit).... a cell phone photo would be valuable.... as a superior officer you have a couple of additional options.... private or public counseling..... public counseling carries the danger of escalating.... obviously his training did not teach him he is supposed to SET THE EXAMPLE.....not be the EXCEPTION.....his stupidity may lead him into a greater error..... making a small infraction into a major problem..... my private counsel would be in a low controlled voice .....starting with requiring his information which I write down....second I educate him with his responsibility to lead by example and correct his delusion of privilege .... finally I order him to conform to regulation.....
I had almost this exact scenario.... the young Lt ignored my advice ( I was an NCO advisor to an ROTC cadet )..... The Lt's first OER stated " This officer has absolutely no leadership ability".... You can not educate STUPID

He/she Needs some senior NCO guidance and perhaps a talk from the BN commander first. 2LT needs to understand that their job is to LEARN. -not make decisions. They can be part of a collaborative decision making process with their NCO and then deal with the negative repercussions. Any officer who's worth a shit will understand this

File his name away for future reference. There are AxxHoles in every rank.. Of course there is always the IG you can report his butt to, but if you don't have witnesses they will brush it off.

Dismiss it, let his ass become grass by someone higher up then him.

Let's say you're an EM and see a Captain waving a rifle uprange. Proper action is to rip it away from him, say, "Sorry, stupid, I mean Sir, that's a range safety no-no." Ok. Now, you're an EM and you see a FNL wearing a clown hat in the commissary. You can either (1) knock it off his head, (2) chew him out for disgracing the uniform or (3) let him wear it for all the world to see what a clown he is. I would do (1) if he was wearing it on a public store or bus etc. I might do (2) if I could do it in private. I'd probably do (3) though. Unless you are the only possible consequence for his idiocy or arrogance, his activities will speak for themselves, to everyone around him, including his superior officers, who will be sure to inflict consequences upon his ego and his brief career. OK, I would probably also say "Bad look for you, Sir," and find a subtle way to accidentally trip him into the pie display. Clowns and pies do go well together.

Shit in his boots

Don't be his friend, he will follow you home. This is why there is a Chain of Command, address this UP your Chain of Command and wash your hands of it