I brought my camera along on a prescribed burn here in the Ozarks last fall. The engine in this photo is used as a holding resource for the fire, following behind the lighting operations, (and eating all the smoke.) They also act as a source for refueling the lighter's drip torches (which you can see 2 of on the top right side of the engine.) My camera smelled like smoke for awhile after this day... For the story on that day: http://terrafondriest.com/blog/2012/10/fire-fall-and-follies