Sounds surprising, but a set of econometric equations was essential to the wartime development of the gunsight of the B-29 bomber.
I recorded an interview a few months ago with Charlie Roos on this topic.
Charlie is an emeritus professor of physics at Vanderbilt University. His father, Charles F. Roos, was the chief economist of the National Recovery Administration under FDR, and one of the founders of econometrics (along with Irving Fisher and Ragnar Frisch).
The video I have linked goes for three minutes. There is a much longer interview with Charlie about his father's work and more, which you can get to via the pop-up at the end.