Newps wrote:
We do regular ATC tours here in Dayton, OH and all noncitizens are
barred from attending, including the chief flight instructor who
organizes the tour.
Are noncitizens barred from =working= at ATC?
All controllers are citizens.

the funny thing though is that the soldiers or national
guards who sometimes guard these sensitive installations
and airports, in full battle gear, armed to the teeth,
do not have to be citizen...

--Sylvain