Hemmings posted an article about the Badlands Bombing Range in South Dakota, that was used for bombing practice until the 1960s. They used cars from a junkyard to set the perimeter for the planes to see (most look like they are from the 1930s). There is a photographer who took pictures of all the abandoned cars, and he has started to ID them.

http://blog.hemmings.com/index.php/2015/09/14/another-use-for-old-cars-blow-em-up/

http://www.nebraskaaircrash.com/bombingrange/badlands.html