The giant potato was sighted at 9:35 a.m. hovering over Cheyenne Mountain. The year was 2022. It was mid-February, about 50 degrees. The sky was blue. The flying spud, or what looked like one, was sighted by an Army intelligence officer and four members of his unit from Fort Carson in Colorado, according to documents that were among a new tranche of U.F.O. files released by the Trump administration on Friday.