What kind of language does the author use to describe the German officers?

Simile:

"Don't worry. It wasn't anything. It was the two soldiers who stand on the corner of Østerbrogade—you've seen them; you know the tall one with the long neck, the one who looks like a silly giraffe?"

Metaphor:

For Kirsti, the soldiers were simply part of the landscape, something that had always been there, on every corner, as unimportant as lampposts, throughout her remembered life.