It's a German plate in US-size. The two letters on the top line are looking like "HK". so it's a privte car of a member of the US-Army in Germany.

As I know "HK" is always in US-size for cars, the brought from home to Germany. Cars, they bought here, have "AD" and "AF" as first letters. That plates have the usual German size.

Quite new is the combination "IF", I don't know, in which size this is.