Kewbick,
Welcome to PPRuNe and congratulations. It's Cut Bank Municipal Airport (KCTB), near the eponymous incised creek (
https://en.wikipedia.org/wiki/Cut_Bank,_Montana).
The picture is from when it was being built as a B-17 training base during WWII.
Here's the airside view of the hangar, framing the lovely Stinson 108 that I went to Oshkosh in. We cleared customs here:
Kewbick has control