Answer
Vizeadmiral was Lütjens' rank in January 1940. This rank is equivalent to Vice Admiral in the English-speaking world, and is one rank below Admiral. Lütjens was promoted to Vizeadmiral in 1939, after serving as Konteradmiral (Rear Admiral) since 1937. He held the rank of Vizeadmiral until his death in 1941.