I've met and spoken with several military heroes, including MoH winners and the heroes portrayed in Blackhawk Down, and what they have in common is they don't think of themselves as heroes, at least not the way CNN thinks of heroes. From their POV, that kind of heroism is all about spin.
So from my POV, a heroic nurse is one who works on her critical thinking, job knowledge, team building, compassion, initiative, communication skills and so on. To me that nurse is heroic and someone I'll observe and learn from, whether or not circumstance favors her with exceptional drama and exposure.
Daniel was a hero before he took the field against Goliath, back when he faced off with a lion with no one to see, and, we may presume, even before that. We all have such heroes, or pre-heroes, if you insist, on our floors. I don't know about you, but I'm out to watch them in action and pick their brains before they get famous.