Crewman Duel was a Starfleet officer assigned to the Enterprise's armory section. In 2152, he and Crewman Perkins assisted Malcolm Reed in analyzing the fragment of phondrikaar they had discovered on Eris Alpha III's moon. (ENT novel: What Price Honor?)

Enterprise (NX-01) personnel
Earth Starfleet personnel	Almack • J. Anderson • Ansara • J.B. Archer • Billy • Bishop • K. Borovsky • M. Burch • Burrows • Carstairs • R. Chandra • Cole • Cook • Cravens • E. Cutler • Daniels • Diaz • Duel • J. Edwards • M. Fincke • Foster • Garver • A. Hart • Hess • J. Horn • Hutchison • Kelby • J. Kelly • Kimball • Ko • J. Lee • E. Leydon • T. Mayweather • M. McCall • Meir • E. Novakovich • D. O'Neill • Perkins • Phlox • Pointer • M. Reed • A. Rhodes • K.P. Ryan • A. al Saed • Santini • H. Sato • Stepanczyk • T'Pol • Tom • C. Tucker III • Williams • unnamed Enterprise (NX-01) personnel
MACO contingent	D. Chang • C. Eby • S. Guitierrez • J. Hayes • N. Kemper • D. McCammon • J. McKenzie • M. Peruzzi