The 19 firefighters killed Sunday in Arizona were part of an elite crew known for working on the front lines of region's worst fires, including two this season that came before the team descended on the erratic fire that claimed their lives.

Hotshot firefighting crew killed in Arizona was highly trained (VIDEO)

The 19 firefighters killed Sunday in Arizona were part of an elite crew known for working on the front lines of region's worst fires, including two this season that came before the team descended on the erratic fire that claimed their lives.All but one member of the Prescott-based Hotshot crew died in what was the deadliest wildfire for firefighters in the U.S. in decades.Members of the Prescott-based Granite Mountain Hotshots take part in emergency drills in 2012. (Connor Radnovich/Cronkite News/AP)Prescott ...