Be respectful. Let
him ask the questions. He will engage you, and sell the Army to you - not a bad thing.
He's prolly gonna ask you what you want from the Army - what you want out of life. Think about that now, and have an answer - not some recitation, but what you really want. And not some blue-eyed shit about being an SF guy. He'll try to "sell" you that, and anything else you show interest in. Again, not a bad thing, just don't commit to anything yet
Listen to what he asks you, and then think about your response before you pipe off. Don't tell him what you think he wants to hear - tell him what you think, and what you want.
He can, and will, offer you many things. Listen to all of them -
Don't sign up for anything, yet. Make sure you completely understand all of the options he gives you before you give him any answer. And you, by
no means, have any obligation to answer him tomorrow, as far as commitment.
Then let us/me know what you brought back from the meeting.
After that, we'll throw you to the lions
