What do you do when a soldier refuses to listen to your directions?

REALLY? You are going to fill out paperwork and let this ahole wear his glasses?
I'm with SFC at bottom. Crush them then pt his/her butt till they puke. Then do more till your tired.

Old School

First time; ask
Second time; tell him.
Third time; let your supervisor know or leading NCO and provide the instruction.
Supervisor will make it clear to the soldier to take off the sunglasses, or be written up for refusing 2 NCOs by not following or complying to orders.

Minimum...extra duty. You do not destroy his private property. Article 15 is the behavior continues.

You should use your command policy, and have your PSG enforce it, then your 1SG. After several counseling for corrective action, then push for UCMJ....

If you are the most senior soldier and he wasn't listening, then I would write him up for insubordination. But if you were of the same rank, then I recommend getting a SNCO involved and respectfully explain the situation. The SNCO should either back you or correct him by himself. I've run into similar situations where because of my junior rank status people didn't want to follow my orders or instructions. So I put my SNCO on the phone and he told them something along the lines of "Goolsby is right so fix yourself. If Goolsby is telling you to do something, it's because I authorized him to correct you. So if Goolsby is telling you to do something, then you better act as if I told you to do something".

I typically try to avoid paperwork whenever I can, but if he's being blatantly disrespectful and a SNCO can't get it resolved then I have no qualms about burning someone.

In your example the soldier may be disobeying the Commander. Commanders may prescribe the wear, or not, of sunglasses (medical exceptions allowed) when in formation for uniformity of appearance. Sunglasses must be in compliance with guidance set forth in AR 670-1.

I would definitely put it on paper, but it all depends on the trends that you have set before you got promoted. One thing most NCO's fail to learn early on in their career is you permit what you promote. For instance, have Soldiers ever seen you out of uniform at any time. You need to make sure that you are correct before correcting others. However, with all of that aside I would verbally counsel the Soldier if this was a first incident, but I would do so in a way that everybody knows that it will not be tolerated. So I would have verbally addressed it right there and then in the formation so everyone would take notice. If the Soldier further refused to listen, then you have said Soldier follow you to the office and you put it on paper. Failure to obey a lawful order is plain and simple, so is 670-1. The only way this Soldier would be safe to wear approved sunglasses in formation is if he/she had a profile because they just had eye surgery, but I am sure this would not be the case.

Have you tried to figure out why he isn't listening to your orders. Not that it is a reason to disobey a lawful order but to know what is the root cause of the issue. As a leader you need to be able to understand why people do what they do.

Raybans are not part of the uniform, he his in violation. If he refuses to follow orders, he the is in violation of uniform regulations, and in direct violation of the ucmj, for lot following a lawful order of those above him. This is something you mush quash fast and hard, especially in a war zone. The reason we follow orders is so when the orders you give are a matter of life and death we follow without question. I would stomp his glasses, then stomp him . If he still wouldn't follow orders he would be stomped by the chief or first shirt. As a leader you must ensure no matter what orders are followed. If you can not lead perhaps you are the problem. Motivate and lead by example.

Article 15 .