BLUEBOOK BB-4577

1 round, white object flew under jet, appeared to be tracking a/c F-86D at 26000' alt, unsuccessfully chased NL. NL turned w A/C, outmaneuvered it, passed under, climbed to 30000' + came directly over jet 15000' above. Abandoned chase due to lack of fuel. Special Comments: Pilot knew there were no other fighters airborne at the time and other aircraft stationed in the vicinity could not turn outside the F-86D's turning radius. Shape: round