Nelson Kemper

 Sergeant Nelson Kemper was part of the MACO unit attached to the Enterprise (NX-01) during the Xindi crisis of 2153-2154.

During the Xindi mission, Kemper became romantically involved with Corporal Selma Guitierrez, and Selma was soon with child.

Kemper was apparently one of the few who were "in the loop" concerning the reasons behind the faked death of Commander Charles Tucker III in 2161. Tucker apparently helped raised Kemper and Guitierrez's child, a girl. (ENT novel Last Full Measure)