Drill thrall

A drill thrall was a descriptor given to an individual on Triskelion who was responsible for training thralls. They answered directly to the master thrall.

When the landing party from the USS Enterprise (NCC-1701) was diverted prior to transport to Gamma II, instead to the planet Triskelion in 2268, they were given their own individual drill thralls, personally selected for each: James T. Kirk had Shahna, Pavel Chekov had Tamoon, and Nyota Uhura had Lars.

A drill thrall was responsible for attending to each new recruit, such as by providing each thrall with nourishment, and assuring they were well trained for combat. Once selected, a drill thrall could not be refused or reassigned. Kirk liken a the term to a top sergeant.