Memo, 24 Oct. 1968, 1. Note: Werlich’s 3000 mph estimate is an average minimal speed. For example, prior to the closure, the UFO was pacing the B-52 at three miles while matching the forward speed at about 300 mph. It then altered course (about 45 degrees per Werlich’s map) and would have accelerated to 6000 mph, before decelerating back to 300 mph while altering its course to resume pacing the B-52 at one mile. The change of position occurred within one 3-second sweep of the radar.