I did have a few with the 21st Miss. and some various other units that I cannot remember, they were mostly uncles and cousins. One of my grandfathers rode with the 24th Miss. Cav. at the age of 14. All told I have a little over 30 confirmed Confederate vets in my lines.
Don't know much about flag history, but Jim does have a discussion board for flags. You will have to find it on the dropdown to the left side of the page.
GP