"It?s important to note that the Tier 5 Retrofits can only be earned by completing the mission during the three-year anniversary event, and the box that it is contained in can only be opened once the character reaches Rear Admiral (Fed) or Brigadier General (KDF) rank. Ship stats are available here."
I did the Temporal Ambassador mission, and when at the end when it hit a loading screen, I sat there for 35 minutes waiting, disconnected, tried to reconnect and was over 2k in a line of almost 10k queued. I just disconnected and stopped trying. I have never seen such a thing occur, not even with new content, so I'm suspecting there's some server issues. I can't believe a free ambassador ship pulls enough people from the woodwork to freeze up the game with over 10k people waiting in line in addition to the number who are already connected. Anyway, I was hoping to grab the ship before leaving town, but it would seem I'll have to hope I get another chance before the event ends.