Another project, known as "Acoustic Kitty," involved wiring a cat with transmitting and control devices, allowing it to serve as a mobile listening post. A heavily redacted 1967 government memo released by the archive Monday suggests that cats can be altered and trained, but concludes the program wouldn't work.
Reminds me of a mind-control/conspiracy rant I saw on Psychoceramics, which suggested that, since it is possible to get video out of a cat's optic nerve and (theoretically) to control a cat's motivation with direct stimulation of the brain, then cat-owning paranoids should beware if their cat disappears and subsequently reappears and starts taking an undue interest in their actions.