Rasett Milio was a human male scientist who served in the Galactic Empire's Tarkin Initiative as the administrator of its HECIL division. Milio's projects focused on the creation of containment channels and force fields in order to "sheath" energy unleashed by a superlaser into a .
While part of the Kyber crystal research team, Milio wore a blue-and-white engineering jumpsuit. The jumpsuit had antiseptic coveralls, which were marked with the insignia of both the Empire and the Tarkin Initiative. His uniform had a tunic that would change colors when in the presence of dangerous radiation, and shoes grounded against potential static charges within the labs. His jumpsuit included a pocket over the chest that held code cylinders, which unlocked access to restricted laboratories.
Rasett Milio first appeared in the 2016 Anthology film, Rogue One: A Star Wars Story, in which he was portrayed by Alan Rushton. Though the film's credits refer to him as "Engineer," Milio's name was revealed in Star Wars: Rogue One: The Ultimate Visual Guide, a reference book written by Pablo Hidalgo released on the same day as the film.
- Star Wars: Rogue One: Rebel Dossier
- Star Wars: Rogue One: The Ultimate Visual Guide
- Star Wars: Rogue One: Ultimate Sticker Encyclopedia
- Rogue One: A Star Wars Story – The Official Collector's Edition
- Star Wars: Rogue One: Death Star Deluxe Book and 3D Wood Model
- Star Wars: Absolutely Everything You Need to Know, Updated and Expanded
- Star Wars: Geektionary: The Galaxy from A - Z
- Star Wars Helmet Collection 49
- Star Wars: The Complete Visual Dictionary, New Edition
- "The False Economies of Scale" — Star Wars Insider 192
- Ultimate Star Wars, New Edition