FMS serial 93-0744. Serial 6643 is one of 150 Fighting Falcons ordered by the Republic of China Air Force (RoCAF, Taiwan Air Force) in 1992. The 120 As and 30 Bs were delivered under the Peace Fenghuang FMS programme. 6643 is assigned to the 23rd Tactical Fighter Group (23rd TFG) that is commanded by the 4th Tactical Fighter Wing (4th TFW) / (455th TFW) at Chiayi.