In the late '70's, found one of these in a cow pasture one day, a little beat up and worse for wear. My family's farm in S.W. Iowa, two miles from the Missouri boarder. It was a inert BDU48B Practice Bomb, except it was painted orange. Could only of been there a couple of days or we would of seen it. Actually, I think the cows might of found it first because they can be very curious about such things.
We had a lot of Air Force and Air Guard planes that flew over our propriety, even though we good 60 miles from any kind of military base or city of any size. Missouri ANG C-130
Hercules and Nebraska Air Guard RF-4C
Phantom II.
Seeing the (Boeing 707) EC-135
Looking Glass planes out of SAC Headquarters at Offutt AFB was almost a daily occurrence. Often at about 3,000 feet, cruising at speed and maneuvering, which is really low for a plane that size.
Perhaps it fell off an F-4 on accident. Probably at night.
I think our little corner of Iowa was sort of the perfect "turn around and go back point" from a number of airfields. Plus being in the middle of nowhere, it was a good place to make some noise. And it wasn't just our farm. All our neighbors and friends saw low flying airplanes too.