Knowing you can be killed, disfigured, or severely injured within the next few minutes and still doing your job is heroic. Dan Carlin's hardcore history podcast described British soldiers in WW1 looking at their watches and knowing that in 5 minutes they would be going over the top into no man's land and would very likely be killed or injured. That hit me for some reason. Imagine taking your last look at the world around you and knowing that in two minutes you would probably be dead or wrenching around on the ground in complete agony, but you still go.