Commodore is (now) a title, not a rank. It was not always that way.
Commodore can refer to a Rear Admiral (Lower Half), which was Grace Hopper's rank (IIRC it was awarded long after her retirement). Commodore can also refer to a group commander -- for instance our Destroyer Squadrons are commanded by a Commodore, who is an O-6. Same with Naval Special Warfare Groups.
Commodore as a title and a rank has a long and storied history all the way back to the days of sail in the British Navy.
She kept getting called back to active duty, but to do that they had to promote her, otherwise she would have exceeded the time-in-grade requirements.
My one big regret in coming to work for what was then the Defense Communications Agency in September of 1989 was that I had missed meeting her wandering the halls of the basement of the Pentagon by just a few months. But I did work with some people who had known her personally.
I wish I could have as well. Unfortunately she died a couple of years before I joined the Navy. My rate (DS) was heavily influenced by the things she did.
Commodore can refer to a Rear Admiral (Lower Half), which was Grace Hopper's rank (IIRC it was awarded long after her retirement). Commodore can also refer to a group commander -- for instance our Destroyer Squadrons are commanded by a Commodore, who is an O-6. Same with Naval Special Warfare Groups.
Commodore as a title and a rank has a long and storied history all the way back to the days of sail in the British Navy.