1. A former Military pilot colleague of mine does stutter - but not when talking on the radio or over the I/C - something to do with not hearing your "own" voice but an "electronic" impression of it.
2. Another former colleague stuttered all the time whether on the radio or not. During GW1 someone in the Signals Section thought it would be a would be a hoot to give him the callsign Four Four Foxtrot
3. Love the Floyd song!!