User blog comment:HellHoundSlayer/Anyone Interested In This?/@comment-4559524-20110707030720/@comment-1886172-20110707150905

No Echo was a rookie. Then after the destruction of the Rishi moon base he and... Fives were upgraded to 501st. After the episode Arc Troopers set during the Battle of Kamino they were promoted to Arc Troopers. Then he died when either he was killed by the dogs or he died when the ship was shot. Both died I just don't remember which one died which way.