Iowa has not been a hotbed of UFO phenomena, but there are some reports and there seem like well-represented human connections to the phenomenon.
On March 26, 1897, in Sioux City, Robert Hibbard was caught by a device attached to a line from an unknown airship and was dragged until his clothing tore. (Similar airships were seen in the surrounding area over the next few days.)
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April 15, 1897, Linn Grove, A large object was seen flying just north of town and appeared to land. Five men searched and located the craft 5 miles north of Linn Grove. As they approached two figures boarded the object as it spread wing-like appendages and flew off. Most town residents became aware of the craft and saw it in a fight.
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December 17, 1977, Council Bluffs, A luminous object accompanied by a flash was associated with a mass of nearly 50 pounds of molten material. https://www.dailygrail.com/2022/02/...ed-ufo-case-with-modern-scientific-equipment/