Elsmere, Delaware, Linden Ave. Park Large round not helicopter blades many colored flashing lights all the way around it, black I beleive

I was young were all in the Linden avenue park, in Elsmere Delaware, I spoke to many over the last years on Facebook that remember the incident, I was out in the park with my cousin, grandfather and uncle, the park was full of people the sun was just going down, it came over the rowhouses over linden avenue came right into the park maybe 6-10 feet off the ground, it was huge brightlights many colors flashing, no helicopter rotors yest several men were yelling, first to stay out from under it to saying it was a stunt, but many and even the viet nam vets drinking in the park were saying its was a UFO and they were here quite often, it was like nothing I had ever seen I believe it was 1969-1972 ish and just before dark, in an area of the park of linden ave closer to Dover ave, not Baltimore ave, it silently lifted off after about 20 min or so and was gone!  I have seen many even a triangle over my house I photographed it was whirring in the clouds just a few yea! rs ago  Here in Stanton Delaware in the middle of the day after a rain storm pic was on FB I will have to check it out.
Witness indicates that the date of the sighting is approximate.  PD