Those who complete the mission will earn a Support Cruiser Starship ? Ambassador Class (Tier 3), as well as a Support Cruiser Retrofit Starship ? Ambassador Class (Tier 5) ? this Retrofit 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 a player reaches Rear Admiral rank.
Note the bold portion.
Excellent News. I'm glad I'm wrong about my speculation.