An old army joke

In general, men's socks are black, gray, white, beige, dark brown, dark blue, dark green. This is standard length. Everything else is for pedestrians.

He stops the deputy of the young lieutenant and says, "What are you, Comrade Kozlov, striped socks? According to the statute, the socks of the officer must be either black (he lifts one trousers), or green (he lifts another trousers).