In 2155, Phuong was sent on a mission into Romulan space with Commander Charles Tucker III in order to sabotage a Romulan warp seven development project. The first part of the mission was to head for Adigeon Prime in his aging Rutan-class ship Branson so that he and Tucker could undergo cosmetic surgery and take on the appearance and identity of Romulans.
Once the surgery was completed, he and Tucker entered Romulan space and headed for Rator II, where they infiltrated a Romulan terrorist group called the Ejhoi Ormiin, that were supposedly sympathetic to Earth and her allies. After discovering the truth about the Ejohi Ormiin, that they were no better than the Romulan leadership, Phuong attempted to get himself, Trip, and the Romulan scientist Ehrehin to safety. Phuong was murdered by the group's leader, Ch'uihv, who in reality was the Vulcan-Romulan double agent Sopek. (ENT novel: The Good That Men Do)
|Known members and associates of Section 31|
|Primary universe||Olivia Akomo • Caliq Azura • Julian Bashir • Lance Cartwright • Cole • Dietz • Matthew Dougherty • Sarina Douglas • Franklin Drake • Enderby • Darwyn Friel • Harris • Jedburgh • Bendes Kettaract • Ken Kitsom • Jhun Kulkarno • L'Haan • Peter Lawrence • Ethan Locken • Roberta Luke • Merra • Erovan M'Rill • Tinh Hoc Phuong • Erik Pressman • Malcolm Reed • Tomas Roeder • William Ross • Connaught Rossa • Sakonna • Luther Sloan • Aubin Tabor • Malla Tancreda • Kestellenar th'Teshinaal • Charles Tucker III • David Webb • Vasily Zeitsev • Cortin Zweller||31|
|Kelvin timeline||Thomas Harewood • John Harrison • Robert April • Alexander Marcus • Yuki Sulu • unnamed Section 31 personnel|