In the year 1974, he served under Corporal Erich Kilheffer as a border guard at Brandenburg Gate in East Berlin. After Gary Seven and Roberta Lincoln escaped, Gempp reported to Kilheffer that they had found a disoriented man near the Soviet embassy. Kilheffer declared that the man was a spy and arrested him. (TOS - The Eugenics Wars novel: The Rise and Fall of Khan Noonien Singh, Volume 1)
- Sergeant Gempp was identified as being under Corporal Kilheffer's command, even though a sergeant normally outranks a corporal. However, it is possible that Gempp's grade was the result of a non-combatant role, placing him under Kilheffer in tactical situations.