How do I get past the guard by the stairs on the third floor

Hint 1 of 6:

Make sure you're in the soldier uniform.

Hint 2 of 6:

He looks like he could take insults well.

Hint 3 of 6:

Tell him:

Hint 4 of 6:

* His pants are wrinkled.

Hint 5 of 6:

* He has a stain on his jacket.

Hint 6 of 6:

* Tell him to move to the side.