betleH 'etlh
- 23rd century operation of Imperial Intelligence devoted to surgical alteration and modification of Klingon agents for infiltration into Federation outposts (TOS Novel: Errand of Vengeance: The Edge of the Sword)
- Translates as "The Blade of the Bat'leth" (TOS Novel: Errand of Vengeance: The Edge of the Sword)
- Members known as Infiltrators (TOS Novel: Errand of Vengeance: The Edge of the Sword)