Retired military couples invitation addressing

My FH is military, and we are leaving it as Mr. & Mrs. Since its not a military event, I don't see the need. In reality, we wouldn't address them as CPT or COL anyway in a social setting. But....its your day and you can do whatever you like. However, I would go with the first option to reduce crowding the invitation addressing section.

No clue if there's a correct way, but I think the first option of pluralizing the titles sounds more natural

I could be wrong, but do you have to put the division of service they were in? If you were sending one to doctors, you wouldn't put MD or PhD at the end, you just use Dr as the prefix.

I would guess that the same would go for the military? You'll run out of space on the envelope.

But I would list them separately, not as The Colonels/Captains.

I was going on what my father was saying, though he was also recommending just going with Mr. and Mrs., and he said that the full formal title included the branch and that they are retired. I'm not sure if this is only for specific occasions or not though

For official correspondence, branch of service and noting "retired" is required. For a wedding invitation, you leave those off.

Also, it is acceptable to use the DoD abbreviations, in this case Col & CPT. Even when both spouses have the same rank, it is most formal to address each individually as in your second example.

Thanks! That is really helpful information

Is it really that important to them that you use their military titles? As prior service myself, I don't really get it. It was a part of my life, but it's not who I am as a person. Interesting concept though, I never knew people did that. Also, you picked a great date