My brother flew F-94 fighter-interceptors during the Korean war, stationed in Japan. He and his squadron had quite an experience chasing a UFO.
When it was written up in Stars and Stripes, he sent me the article. I wish now that I had saved it !
I love these stories....
Several U.S. soldiers saw a bright UFO that looked like a falling star,except that it stopped falling and began to climb again.
It then moved northeast at about 150mph, reversed course twice,then climbed at a forty five degree angle and faded from sight. One guard reported a pulsating sound from the object. An Air Intelligence Information Report stated that an F-94 attempted to intercept this object. The pilot described it as round,of unknown size, “brilliant white” and leaving no exhaust. It undertook clearly evasive maneuvers and pulled away from the F-94 at thirty thousand feet.
According to this intelligence report,”the object possessed a superior speed,superior climbing ability,and was able to turn equally as well as the F-94”
http://www.abovetopsecret.com/forum/thread547582/pg1
http://www.project1947.com/fig/korea52a.htm
http://www.project1947.com/fig/1952a.htm
https://www.history.com/news/korean-war-us-army-ufo-attack-illness