Terra Torch
A wildland firefighter uses a terra torch during firing operations on a prescribed burn. It shoots a stream of burning liquid and is used to generate high amounts of heat. It's a useful when fuels, meaning the brush or other material along the fire line, are too green or too sparse to carry fire easily. It's used along the edge of the fire line to get full consumption of the available fuels, which is called blacklining. A solid blackline reduces the risk during prescribed firing operations of the fire escaping the unit being burned.
This wildland firefighter was working on creating a blackline on the Sunlight Mesa prescribed fire before interior lighting operations took place.