Yeah.. my brain is like sawdust M. I do recall one old caravan being used for contingency purposes if the tower was "u/s". It was down near Bl 85 and I went to it on one of the first bomb scares and it was chaos. 10R for departues and aircraft got fed up with waiting and just went!! The noise was unbeleivable and we couldn't hear each other... and the comms to the "real" tower weren't working. Happy days.