Jose wrote:
So perhaps in a on-demand facility (where a terrorist incident might...

On the battlefield, this is a consideration. We are not on a
battlefield, despite what our president wants us to think.

They surely have a terrorist incident response plan. And part of a
plan to ground all aircraft (similar to 9/11) in the event of another
attack. One part of that plan might be that controllers on break are
required to be alert. Hence no naps.