My daughter-in-law, K, is a nurse who is on the front lines at a major US teaching and research hospital, treating COVID-19 patients.
Here's an interview with another nurse who has not yet been sent to "the front."
The orders can come at any time. K was happily doing completely different work and one day a supervisor told her to organize her area for the existing patients to be moved out and a batch of COVID-19 patients moving in.
I don't feel any different than if she were an infantry soldier in a "hot" war zone. That's a blend of pride, fear and mostly a disgust at the idiot whose idiotic decisions led to the unnecessary danger she's in.