Elementary School Watches Lights in the Sky

1973-4? Earl Frost Elementary School, San Jose California.
 Oldest sister remembers standing on the school field looking towards mountains saw three long white objects/lines  above the mountain (Mount Ummanum Radar Tower - Santa Teresa hills). One was brighter white than the others, their brightness faded in/out silvery. Students came out to field to watch them. They did not move and eventually just disappeared. Clear warm sunny day. Mid day? 5th or 6th Grade?  Middle sister recalls Ms. Nass(?) class out on recess in field playing kick ball, bell rang, folks stayed out to watch, other student came to watch. Shiny Cigar shape, one more big one, two more appeared out of nowhere, then they disappeared, then the main one stayed for some time. Did not move. Really shiny silver brilliant reflection. Warm day, clouds, UFO partially visible, partially not visible. 4th or 5th Grade?  I remember someone came in from outside and said there were UFOs in the sky and the teacher let us go to the field and watch. It was a warm and sunny day. The afternoon I think. There was one big/bright/long one and shorter ones. Reminded me of a florescent tube floating in the air, or an airplane when the sun reflects off of it. But these just floated in the air.  A small one was on the nearby hills (1 mile away).
 Most of the school went out to the field to watched. Folks after a time went off to do something else. I don't think it was seen as a big deal.