In 2001, Car and Driver magazine wrote an article  on this that supplies additional narration, context, and detail.
This is a bigger version of the Soviet TMS-65, which is a jet engine on a turret on a truck. It's for decontaminating tanks after a chemical attack, and can also be used to generate smoke screens.
Since the video on the page isn't loading correctly, you can find it here: https://www.youtube.com/watch?v=5EYRPJgZdp4&feature=youtu.be
I actually seen photos of those in action: during 70s, my parents had natural gas well in their backyard and one day it did catch the fire. Fire fighters waited for week or two and hoped the gas will deplete itself, after that they bring those machines which blow out the fire. So those machines are probably few decades older than stated in article.
The M1 Abrams actually uses a gas turbine for propulsion too.