The Nerimian Defense Initiative was the military arm of an extra-galactic faction called the Nerimian Galactic Confederation a.k.a the Sol Confederation. It was an ally of the Yamatai Star Empire beginning shortly after the Star Army of Yamatai's formation in YE 21 thanks to negotiations by Ketsurui Yui. When the Second Draconian War broke out in YE 24, Yamatai joined the fight with millions of ships. An enemy incursion into the Star Army universe resulted in the battle of Ralfaris. After the war, the NDI retained bases in the Ether and Xylar systems until YE 32. At present, there are no NDI forces remaining in the SARPiverse.
The NDI was played primarily by Derran Tyler.