I see from your response below that you are sorry you mentioend you were in the military as that has nothing to do with your complaint.

As others have said, we weren't there so we don't know exactly what happened....but your issue is with Expedia (which is exactly why I don't book via third party websites).

I don't understand how you can expect Delta, or any airline, to give you travel vouchers on any airline you want. It's not that Delta failed to address your problem - it's that they didn't address it in the way you wanted.