Some nurses change jobs to less stressful ones. Some nurses have children and change jobs for family reasons.
We spent three weeks in an ICU last year. Most of the nurses are young, unmarried, and able to handle dealing with patients who are going to die. This particular unit sees a lot of death. It is not an easy job. A lot of nurses simply cannot do that particular job and stay sane. All nurses are not created equal. We want it that way.
Nurses are FREE to go to different employment. Soldiers have commitments that are more binding.
I know nurses very well, of course they change jobs and so on, but they don’t suddenly flee nursing when the sick start arriving, seeking help.