What was the "U" Shaped Object Seen in Nebraska in 1955?

 December 20, 1955, near Decauter, Nebraska (near the Missouri River and DeMoines, Iowa) witnesses reported - with drawings - sighting of an object that was shaped like a fat "U" with red lights at the far tip of the opening and two bright, steady and glowing white lights on either arm of the "U".  Colors of lights reported to be red, green, blue and white and the object said to be very large. It was moving south, then hovered, and rose straight up to disappear from sight.

On December 31, 1955, on or near HWY 77 between Lyons, Nebraska and Oakland, Nebraska (NE of Omaha) witnesses observed an orange object, size of a grapefruit at arm's length,  rise out of a nearby field, make a gentle arc over the highway before disappearing from view.