Delilah makes a comment to Ducky about her father "looking down on [them]," revealing that he has died. In the Season 11 episode "Double Back," both Delilah's mother and father are in the hospital with her as she recovers from the attack on the Conrad Gala. That means between that event and the wedding, Delilah's dad passed away.
Margo Harshman returns as Deliah Fielding
The commander's sleeves are rolled incorrectly for the Navy.
DDG-999 was not used a hull number.