The year 2003 marks the 50th anniversary of the disappearance of USAF 1st Lt. Felix E. Moncla, Jr., who, together with his fellow crew member, 2nd Lt. Robert L. Wilson, disappeared over Lake Superior on November 23, 1953, while pursuing in their F-89C "Scorpion" a UFO which was seen on radar. Radar data at the time of the incident suggested to witnesses involved in the pursuit that the object being pursued by Lts. Moncla and Wilson had suddenly reversed its course, approached the aircraft, and "merged" with it.

Read more: http://www.nuforc.org/mancla.html