said by n_w95482 
:I noticed during Field Day that the Kenwood I used most of the time defaulted to LSB for 80 and I think 40, and USB for 20 and 15.
I asked about it the next morning and I was told that it's kind of a tradition/habit that people do, but not set in stone.
If I recall, I think the only one that it does matter on is 60 meter, and it has to be USB.
You are correct. Other than 60M (where the permitted frequencies are "channelized" by FCC rules), there are no specified rules for USB/LSB on HF frequencies.
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