US Army Battles UFOs in Vietnam

One incident occurred on June 15 1968 when a patrol boat known as PCF 12
encountered a hostile UFO.

At 12 30 am, PCF 12 received a frantic distress call from another patrol boat in
the vicinity PCF 19 claimed they were under attack by unidentified lights.

They believed these were enemy helicopters. It was an odd report since their North Vietnamese enemies were not known to use combat helicopters at the time.