The SDFN ships are the mass-produced version of the original SDF-1 Macross and appear almost identical (including fully functional transformation). These emigrant vessels were built for the purpose of investigating and securing routes in advance of Super-Long Distance Colonization Ships (Megaroad-01). The SDFN is a new model built as a new fold-capable space battleship cruiser and developed as an intermediate immigration ship. The SDFN Class holds only a small-scale emigrant crew of 10,000 people (military and civilian) that is just sufficient for an advance team. The interior of the SDFN-4 Global features a city for habitation and research facilities for Vajra study. A total of twelve SDFN class ships were built. Since the engines and armaments for the SDFN class were diverted from Zentradi medium-sized warships, each warship differs in armament.
The Macross SDFN-4 Global was attached as Flagship of the 117th Research Fleet operating in the late 2040s. It was publically declared in 2048 that a fold navigation error lead to the destruction of the Global and the other fleet ships, but the truth was far more disturbing. The 117th Research Fleet encountered the hostile Vajra in 2048. Ranka Lee was supposedly the only survivor from that fleet and due to mental trauma from the death of her family she had no memory of her early childhood. Some 11 years later, the wreckage of the SDFN-4 Global is found seemingly abandoned on the surface of Gallia 4 by Warrant Officer Alto Saotome of the SMS and civilian Ranka Lee. Upon exploring the interior of the craft it is found to be a portion of a Vajra hive. The Global and the rest of the hive is destroyed as an entrie Vajra fleet emerges from beneath the surface of the planet, attains orbit and commences a space fold. Just prior to the Vajra fleet departing, a Dimension Eater is unleashed on the surface of the planet, destroying a New UN Spacy base, the attached marine battalion and most of the planet itself. Thus how long the Global had been on Gallia 4 or how it arrived on the planet will likely remain a mystery.