flag rank
Noun
Meaning
the rank of a flag officer
Source: WordNetHypernyms
Examples
Also, 24 Captains were promoted to the Flag Rank of Commodore and 19 Commodores were promoted to the Flag Rank of Rear Admiral.
For example, it was not until 2001 that the UK made "commodore" a "flag rank", and changed the shoulder rank insignia (although not the cuff rings) of the higher ranking admirals accordingly.
However, this was considered an awkward title and the one-star flag rank was renamed a few months later to its current title of rear admiral (lower half), later abbreviated by the U.S. Navy and U.S. Coast Guard as RDML.