Yeah, it's a shame. Still, the files are there. They simply used 1-2 seconds of silence. It would be trivial to replace them - in fact someone already put together a voicepack from SW1 & SW2 to use in SW3 and posted it here somewhere.

I've been toying around with some voice samples too, but my sources are mostly H games so they're rather... inappropriate. Need more sources from RTS or shooters.