Ralph Bock, of St. Louis, an electronics engineer, reports the following which occurred between 10 o'clock and midnight, one "night in March, 1955: 'I was the duty officer in the radar van of an M-33 Radar/90 MM Antiaircraft Artillery battery site in Baldwin Hills reservoir area just southwest of Los Angeles and north of Inglewood. During an alert for an unidentified aircraft in the SE area, a strong return was spotted at maximum range due west over the ocean, moving due east. Return moved within track radar acquisition range, and was locked on. Estimated speed of approach 2,000 mph, prior to lock-on. At estimated 10-15,000 yards, target made abrupt turn to port, breaking track lock-on, and moved rapidly north out of range. Intensity of the blip in­dicated a vehicle equal to a larger than the largest commercial aircraft. No known air­craft could perform the turn that the blip described on the PPI scope. The turn was made within a few seconds of track radar lock-on--- ­no time to verify speed. Speed estimated by travel between returns based on search radar sweep time. Calculations verified by radar operator on duty---­he also saw return on scope. Sighting not reported te Area Control until after off-screen. Thought might be system failure. Heard nothing more from A.C."  (Source: Schuessler, John F. "Unusual Radar Tracking Reported." Skylook. #39. Feburary 1971)

Fran Ridge:
No date, so it looked like a longshot, even if the month was recalled correctly. I went to the BB site and tried all kinds of keywords to no avail, but went to the year/month listings and BINGO. Look at the California incidents for march 1955! See NARA-PBB1-123 below.

Detailed reports and documents
docs/NARA-PBB1-123.pdf