Normally you’d think the Captain would be in charge of things like this, however seeing as how in the LGverse being a Jedi is kinda like being a priest and I swear I heard somewhere that the whole “Captain’s can marry people” thing was not true, besides, as I’ve said before. It’s my comic, I’ll do what I want.
Wikipedia. The short version is that naval captains do not have, and never have had, the authority to officiate weddings. Cruise ship captains often pick up the accreditation on the side, so as to cater to people who believe in the trope, but a cruise ship is a whole other animal to a military vessel. Indeed, US Navy captains are expressly forbidden to allow marriages to occur on their ships while at sea.