Badges of rank sleeve insignia / command flag
Rear Admiral is the rank designation for the lowest flag rank the rank group of flag officers in the German Navy
Other naval forces
Also in the naval forces of Belgium, Denmark, Finland, Sweden and Lithuania there is this rank designation. The Commodore is the Commodore of the Royal Navy or the Rear admiral (lower half) of the U.S. Navy and naval forces and a number of other countries comparable.
Lithuania Flotilės admirolas
The rank designation Commodore has not existed in the German naval forces until 1945. In the People's Navy of the GDR this ranking name was also not used. In the Navy and the People's Navy, the lowest rank was Admiral of Rear Admiral.