That depends on where you are at. I can only discuss what I know. I have not met any Commanders, that I'm aware of. I've met a Captain, and my wife will be eligible for Lt. Commander about the same time we leave her current duty station, but no Commanders as of yet, that I'm aware of. I have been to a few formal non military attire functions, so it is possibly that I've met a Commander, but I had no way to identify their rank.