Ohy gets its red color from sand and rock. The black areas are its seas, and the greenish yellow and red are landmasses. Of the planets created by the Terraformer's Circle of Fellowship, Ohy was the first to be successfully inhabited.
Ohy is in one of the farthest corners of the Tarthian Empire and is home to about 2.2 million Armada soldiers. No civilians live here. Due to the isolation, soldiers are routed here for no more than three tradestandard months (nine solar months on Tarth).
Civilians arriving on tour are allowed to enter the main concourse, but are accompanied under guard. It is rumored that ships created at the FIST are tested here before being sent to the fleet.
Here is the official denial that Ohy is a "dumping ground" for misbehaving soldiers: "While it is true that some soldiers routed to Ohy on tours of duty have been involved in less than stellar behavior, it is not true that duty on Ohy is considered punishment." It is interesting though, that slang for duty on Ohy is "Shipped to Oh Hell."