Special Forces weren’t worried about regular soldiers hearing the goats because they’d been de-bleated.

The Men Who Stare at Goats

General Brown: So they’ve starting doing psi research because they thought we were doing psi research when, in fact, we weren’t doing psi research?

Brigadier General Dean Hopgood: Yes, sir. But now they are doing psi research, we’re going to have to do psi research, sir.