Roger Voss was a United States Air Force serviceman, and a member of the Air Force Special Operations group. (Findings at CTU) The following is based on the account of Operation Nightfall from Findings at CTU, which was later retconned in 24: Nightfall. After Hammer One destroyed the Drazen compound, however, the team's radio frequency was jammed, allowing Drazen's men to track down each team member as they attempted to signal to each other. Voss was ambushed by hostile forces and killed, while all of the other team members were eliminated one by one, except for Jack Bauer. (Findings at CTU)