Your heart’s in the right place, I appreciate that, but it’s more dangerous during emergency work like this to pass out or make a stupid mistake from skipping a meal. Infection is treatable, death is not. It’s not practical or logistically possible to simply evacuate every time someone needs to eat either. In situations like this they are likely running long shifts with teams swapping out at set intervals. Trust that these are working professionals that have been trained in how to keep themselves safe.