AC 188, L3 X18999: Rebels attack the Alliance base on the still unfinished colony. Brigadier General Septum, the ranking Alliance officer, allows young Specials officer Treize Khushrenada and three of his cadets (including twelve-year-old Lucrezia Noin) to join the battle. Noin relays communications from the command center. She asks Treize to call her Noin rather than Lucrezia because "it doesn't matter if a soldier is a man or woman on the battlefield."
AC 189: Thirteen-year-old Lucrezia Noin graduates from the Specials' Lake Victoria Academy with the second highest marks in the Academy's history.
AC 195: Noin is an instructor at the Specials' Lake Victoria Academy where she trains cadets to handle OZ's new space mobile suit, the Taurus.
Sources: translations of Episode Zero manga; Endless Waltz (OAV/movie & translations of novelization)