The people with whom I associate quite often bring their jobs home, whether or not they wish to do so.
"Simply" working on combat systems is enough to stick with most of us. We understand that at minimum ~300 souls are depending on us for a combat system which will keep them from harm.
With currect strategies, ships are less likely to be at risk on the open seas, but conversely their weapons are deployed to protect thousands of souls on land.
We are acutely aware of the potential devastation of major errors.
The responsibility does not stay tucked neatly in our desks,
waiting for our return in the morning.
It's there 24/7, whether whispering very softly or screaming out loud.
(Literally screaming; more than one of us has woken up screaming during stressful times.)