Was watching some YouTube and found footage of a fire training mockup in use.
It looks to be exactly the same construction as the pictures here and might even be the one at Andrews AFB.
The section in question starts at approximately 6:10 minutes
The video itself is part 4 of a documentary called Operation Red Flag about the Red Flag training exercise held at Nellis USAF Base.
Part 4
https://www.youtube.com/watch?v=ri-dWOpkIy4
Part 1 is here and there are 5 parts in total
https://www.youtube.com/watch?v=-g3lwKOXWOI