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Sgt, you just have to talk to that individual, letting him/her know that we take our job and mission very seriously, I'm your nco and i'm here to help guide you, you need to show respect and disipline.

From everything I have heard since getting out the correct answer is you don't. I have talked to a former coworker who upon making Sergeant tried to talk to a soldier who was one of his problem children. My friend was disciplined for inappropriate use of language while talking to this soldier. I know some of the other soldiers who were under his command and they all attested to the fact that my friend never raised his voice or swore at the soldier, yet he (my friend) was still reprimanded for his actions. It would seem that in the modern Army perception is reality even if perception is wrong.

The why comes after, not before, prompt obedience.
Plenty of time after to teach the why.

A good soldier will understand that.
If not, get out your pen.

Don't overthink it.
In your gut, you know what is going on.

In large part it depends on how the soldier is presenting his questions and how you reply. Insubordination is pretty hard to miss.

That's all nice but he will get you killed in combat while you try to explain it to him.

If the soldier is asking a question for clarification then answer him/her... then have them move out smartly... you must give clear orders when dealing with soldiers... no room for interpretation... if he fails to follow the order then write him/her up... you can do corrective training also....

There will always be individuals that do not respond. The key is to make sure you are looking at the whole picture. Look at the facts and remove emotions. Use the resources around you including the chain of command. The Soldier might be dealing with a life changing issue or potentially depression or some other challenge that is under the surface. There is a limit as we all have to be able to perform but occasionally we fall short because of significant challenges in our lives. Once you have done all you can and exhausted the resources it might be necessary to separate the Soldier. Stay the Course. You cannot forge steel without a little heat and pressure. Welcome to Leadership. It is both rewarding and challenging. You might want to check out the following post. Hope it helps.
http://asktop.net/q-and-a/how-do-i-help-a-soldier-who-just-does-not-get-it-and-cannot-follow-orders/?all=1

Being a good sgt is to explain the whys when that soldier asks because, if your order not justified I understand why the soldier asks question especially in your military now, im out but your soldiers need to know good and bad orders and know differance even if you dont and hope you know also with the commander-in-cheif if he gives the military illegal orders please do a lot of reading up on orders and what legal and not to teach and protect your soldiers

Your last name should give you a clue... lol

You don't, you lead by example and only discipline as a last resort. They will thank you for it in the long run so long as your stupid fatass and squad are working out enough to offset the difference from being punished...

God the military is dumb sometimes.