go to Google Earth and dial up Jefferson Proving Ground, Shelby, Indiana.
Basically a big loop of track extending about 4 miles east of the N-S Wabash mainline, and passing north of the airfield.
You will find all sorts of storage buildings along the loop, in addition to the ammo bunkers at the far east end.
If I recall, JPG was used to test tank and artillery ammo from WWII at least into the late '70s when I got out of the Army.