The Arkbird is a High-Atmosphere Mobile Spacecraft operated by Osea. Born of the SDI (Strategic Defense Initiative) program in the ‘80s, it was changed over to be part of the Osea-Yuktobania international space development program after the end of the cold war. It was constructed jointly by the two.
Rather than returning to ground, it has maintained a continuous orbit since entering service, making use of SSTO (Single Stage to Orbit) shuttles to ferry supplies and personnel. For this reason it’s technically classified as a satellite, but its ability to make large changes to its orbit by descending into the upper stratosphere means that this is no ordinary space platform; it maintains a high degree of freedom.
Osea Maritime Defense Force - 3rd Fleet