While something as simple as a yawn is unnoticed and uncared for in our society, in this situation, it is very obvious. Every soldier is supposed to conform by dressing the same and standing the same, and yet that is all broken by a single yawn.
I really like how you can't see the streetlights but you can see them being reflected in the water. It makes it seem as if they were just floating in the water. The contrast between the color of the light and water is very interesting as well