Emerald Cove was a UNSC colony world. During their training, the Spartan-II's were sent on an underwater mission with Chief Petty Officer Franklin Mendez. Mendez sabotaged half of the Spartans' air tanks and in return, they stole his. They then, as Anton-044 humorously put it, "ditched him and camped out on an island for a week, with nothing to do but light bonfires, bake clams, and surf". It was a good memory they all enjoyed sharing. Kojo Agu also enlisted on the colony.
In 2542, the UNSC abandoned Emerald Cove due to the danger from the Covenant. There is no information on whether or not there was any combat in the abandonment and/or evacuation. The planet may have been glassed but was likely not even located by the Covenant due to no human presence.
- New Barbados