The SD Platform was only part of an Orbital Defense Network that surrounded the space around the planet Vekta; this Network was made up of even more SD Platforms that linked up to one another via computer networks. Once built, the ISA had no more need for their Navy to stand guard (or so they thought), and slowly demilitarized. Seeing this as the perfect opportunity to strike, the Helghast made plans to invade Vekta.