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)

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May 15, 1952, North Korea (BBU) Location of observer CT 8000   USAF Capt. Rufus Dye of the 18th Fighter Bomber Group flying an F-51 at 9000 feet on returning from the target at the location CT 8000 observed a silver spherical 50 foot in diameter object flying at an estimated 1000 miles per hour. The object flew a horizonatl course for approximately 4 seconds and then went onto s steep climb. The object continued on and went into a shallow descent until lost in the haze.      http://www.bluebookarchive.org/page.aspx?PageCode=MAXW-PBB10-783      Page ID (PID)  MAXW-PBB10-783 Collection  NARA-Maxwell Roll Description  Maxwell Blue Book 10 Document Code  N/A   Frames  783 - 789