Milnn was a male Imperial Navy TIE pilot captain who was the leader of Delta Squadron during the Galactic Civil War.
In 3 ABY, Milnn and his squad were investigating an Imperial distress signal when they were ambushed by a group of Rebel X-wing fighters. The other members of the squad were killed, but Milnn survived the battle only to be captured and interrogated by the Rebels. Rebel commander Luke Skywalker questioned him for the recognition codes for entrance into the secret armada commanded by Admiral Mils Giel which was transporting the creature known as the teezl to the Imperial capital. Milnn refused to cooperate even under threat of a blaster, but he was quick to talk once Chewbacca took over the interrogation.
In an effort to infiltrate the secret armada and destroy the teezl, Skywalker impersonated Milnn as "Delta Leader," with his Rebel TIE squadron posing as Delta Group.
- The Complete Star Wars Encyclopedia