I haven't done many side quests in Ishgard yet so I'm not sure if there is any more information on this than I haven't bothered looking for, but I was wondering if there was any lore behind how to become a part of the Order of Dragoons for Ishgard?

Do I have to be Ishgardian?
Is there some separate trial from the Azure Dragoon trials that I had to do during the Dragoon quest line?
I noticed that they are addressed as "ser" much like a knight would be addressed. Would I have to go through some rank system or apprenticeship in order to become a Dragon Knight?

I did a little research on what an actual dragoon was/is, and as far as I could tell they were specialized knights. So I wonder if maybe the Dragoons in FFXIV work off a similar system of becoming a Dragon Knight.

Any thoughts or help on the subject would be greatly appreciated. If you know of any quests that might have some information please direct me towards them and I will have a look myself. c: