[yangsuli]

Actually I do think firefighters ha the obligation to help.
If he/she refused to do so, it should be a dereliction of duty.

[Fichori]

They very well may.

And if you will recall, I said "They entered because it was their duty and hope to save as many as possible."

So, yes, it was their duty.

But it was their duty by choice.

While firefighters have a formal obligation to fulfill their duty, I believe Americans have an informal duty of honour to those who have given their lives in defense of Americas freedoms.
(i.e help someone in need, because its the right thing to do)

Sadly, sometimes people are guilty of dereliction of duty, formal or otherwise.