The Deltan Triad was the honorary name given to three of the "finest admirals" in the galaxy, all Deltan.
The first was Connor Grey. At his height, he rose from Captain (following the Battle of Tetra 4, after he became the highest surviving ranking officer left) to Fleet Admiral, very quickly. At this height, Fleet Admiral Grey commanded the Deltan Battledome, stationed around New Delta, as well as the Levana, Ankah, and New Deltan Squadrons. He became as invaluable asset during Deltan campaigns and on the whole. He later gained higher rank and other squadrons.
Second was Johnny Raider. He rose to Admiral from his position of Commander quickly as well, always behind his fellow friend and comrade, Connor Grey. Grey's influence allowed him to rise to the rank of Acting Fleet Admiral of the Delta Prime Squadron and the Central Deltan Sphere, then to Full Fleet Admiral. Both Raider and Grey commanded the Deltan Sphere of the Navy, the primary territory of the Deltans.
Third and lastly was Jack Khal. He was not known to either of the previous, but showed outstanding ability. He impresed first Grey, and was promoted quickly to Captain as the head of Grey's flagship, the DSS Legacy. Later, he went up the ranks as need for admirals was dire.
The three of them conquered unimaginable tasks, and inspired their foes, and were feared by enemies of the unbreakable triad.
Connor Grey
Johnny Raider
Jack Khal