Devil’s Den encounter

In 1977, Terry Lovelace, then an Air Force medic, and a friend went camping at Devil's Den State Park in Arkansas. Lovelace says they had a UFO encounter there and experienced missing time.

He also says that in 2012 an X-ray taken for a knee injury showed a small square electronic object deep in his thigh with no surgical scar, which later vanished without explanation. He tells the story in his book Incident at Devils Den; the claims rest on his account.

Sources: Lovelace, Incident at Devils Den