It is imperative that we exercise the utmost discretion in the selection of "clone handlers", not only for the obvious reasons of intelligence and asset protection, but for the lesser acknowledged danger such a task presents to the handlers' own mental health. While the clones are only biologically human, they incite one of two psychological responses: empathy and distress.
If we are not careful to select only candidates who are capable of preventing themselves from forming any emotional connection to the clones, and remain vigilant for such a lapse in character, the combat efficiency of this unparalleled military asset will be diminished. Handlers must see the clones as nothing more than valuable but expendable military hardware.
Research thus far has indicated two primary responses to interaction with the clones, both exceedingly dangerous. The following is an excerpt from an interview with a volunteer who spent several days managing a group of clones through a phase of testing:
"… [I'm] not afraid of them; they just make me really uncomfortable. They seem human, but then they don't do any of the things regular people do, and when you talk with them it's like talking to a robot. Not even an android... [One clone] didn't question it, or even hesitate. [It] just went up knowing I'd sent [it] to [its] doom and obediently died doing what [it] was told... I still have nightmares about that."
This excerpt illustrates the distress incurred upon the volunteer as their mind struggled to reconcile the perception of the clones as human with the lack of human traits, creating what can only be described as a terrifying perversion in the volunteer's subconscious. Such distress is almost universal among the volunteers, all of which, it should be noted, only interacted with the clones for a short time.
More concerning, however, is the expression by the volunteer of guilt and use of pronouns (omitted in the official transcript), indicating a degree of empathy for the clones. This occurrence was slightly less common among volunteers, but nonetheless raises greater implications. Volunteers were prone to viewing them similarly as one would an animal companion, if not as a fellow (subnormal) man.
And while I'd prefer not to end this memo on conjecture, it has long been suspected the clones can be influenced into operating beyond their intended limitations.