May 15, 1952; S of Changsong-ni and N of Nangnim Mountain, North Korea (BBU)

6:35 p.m. USAF F-51 fighter pilot of 18th Fighter Bomber Group flying F-51 at 9,000 ft on 180° heading at 240 mph sighted 50 ft diameter silver object at 1 o'clock position moving to 3 o'clock at 1,000 mph at about the same altitude, which then started a steep climb, but at the top of the loop the object resumed a horizontal course (heading 360° or N) wavered momentarily, descended and disappeared into the haze which reached an altitude of about 7,000-8,000 feet. (Jan Aldrich)

The F-51 pilot was Capt. Rufus Dye

http://www.bluebookarchive.org/page.aspx?PageCode=MAXW-PBB10-783

Frames  783 - 789