Brenton Soule shot these videos at the Britania Mountain Fire in southeast Wyoming. They were uploaded to Facebook August 30, 2018.
I noticed that the audio was more intense than in most air tanker videos… probably because he was about as close as you can get to the aircraft while still remaining safely out of the drop zone.
The air tankers could be the ones photographed at Rocky Mountain Metropolitan Airport (JEFFCO) September 2, 2018. Above we see a C-130 and below, a BAe-146.
Wildfire Today has more information about the Britania Mountain Fire which has burned over 32,000 acres eight miles northwest of Wheatland, Wyoming.