It was 10 January 1961. I do not have the time, but it may have been in the AM, I believe. It was no doubt on the NICAP Form. I cannot recall if I or another Unit 3 member sent it to NICAP.
The rocket you are seeking was an early US Navy Polaris launched from a ground pad at Cape Canaveral. I spoke with the PAA Security Guards after it had been observed. I gave PAA a blank NICAP UFO Report Form. The disc altered the tracking, it did not block it because the tracking system continued to follow the disc and later returned to again track the Polaris downrange.
It was larger in diameter, and its diameter was close to the length of the Polaris. In other words, it was a disc and not tubular like the body of the Polaris. The diameter was approximately 20 to 25 feet in diameter and a width of perhaps 6-8 feet at its center. Not big enough for a normal human to be comfortable within.
It was visually lost to ground observers and I with my 10x50 binoculars at the Cape as it continued downrange, but departed the Polaris causing the temporary loss of tracking. I did see it depart.It was filmed