After the Deep Striker and Dragonfly space combat mobile suits had seen success in space combat, General Dynamics engineers were approached by the NAR Marines to develop a third space-focused mobile suit. NAR Marines wanted a cross between the Deep Striker and the Dragonfly, a suit that had theater flexibility but excellent space mobility with a balanced weapons package.
General Dynamics came up with a mobile suit inspired by the Rick Dom, but with added features for space combat. The RMS-099 Rick Dias has one of the best self-contained space mobility packages of a standard mobile suit, but keeps the leg-based frame of the Dom, to allow for space colony use out of zero-G. Equipped with two anti-missile backpack cannons and a handheld beam rifle, the Rick Dias can utilize many different weapons systems as well.