FORT ST. JOHN, British Columbia (AP) — When James Bergen steps from a plane and plummets toward fire below, he's not scared. Instead, he says, he gets a rush from not knowing exactly what he'll face when he parachutes in as one of the smokejumpers confronting the wildfires that have scorched Canada this spring and summer.

One call may mean a drop and a hike to a meadow to put out a single burning tree. "Next day you go to a fire and it's a giant roaring beast threatening a community," said Bergen, a solidly built 46-year-old with graying stubble. "That anticipation of what you're going to get,...