Sourcing status: Disputed — this is a contested claim, not independently verified. Presented as a documented claim, not established fact.
An acorn-shaped object was reportedly observed descending into woods near Kecksburg; military personnel were said to have cordoned the area and removed an object overnight. NASA's later explanation as a re-entered Soviet probe is contested; Army records have been the subject of repeated FOIA litigation.
Sources
primary_doc: NASA FOIA file. Kecksburg incident (released 2007)