The Tower Talker is one of those things we hear all the time but most of us know little about. As part of my access to range 4, I was able to get up into the tower and get a video to show their view of things, and a little of how they do it. You will see a book in the center that has the entire script for everything that needs to be said, and they keep moving markers on it to be sure they don't loose their place during the very repetitive commands they are giving. There is a panel in front of the talker with, among other things, a button he pushes to start the 3 second delay before targets turn. Also note the wind moving things around a little.
http://video.google.com/videoplay?docid=-7119189599128636153

Clark