It is a perfect example of rising to meet the need- a knightly aspect. I don't know that I could do as they are doing...and having worked in the nuclear field previously, I know exactly what it is they face. Would I have done as they did? As you said, Sir Edward, I do not know either, but I hope I would.
As intelligent beings, we know we live a finite life, but we do not know the exact date and time of our demise- not unless something external forces our awareness toward it, like this, or say a bout with cancer. These people are staring death down for the good of their countrymen, they are true heroes, knights even. We all have the capacity for greatness...but not all of us bother to indulge in it, whether from fear or some other cause...