The burn boss scanned the snaking trail of the Swasey Recreation Area through thick black sunglasses. She saw firefighters scurrying on a hill above in a smoky blue haze. They were setting dozens of fires to burn away piles of sticks and shrubs that a lightning strike or cigarette butt could use to grow into a wildfire. Their work was part of a key prescribed burn training that could help them move up in rank. But there was a much deeper meaning for burn boss Erin Banwell and the firefighters in the haze. All but a few were women, and they were taking part in the first majority-female training exchange, called WTREX, in a profession that is known for shunning women.