I was home leaving to pick my two boys from church school. an unusual noise coming overhead from the south got my attention. the group came out from the trees at about three to five hundred feet above ground heading north.They were traveling at about forty miles per hour in a north-westerly direction. they were almost completely silent, just a low frequency hum and the buffeting of the wind as they passed.They were tethered together and no doors or windows were visible. this sighting happened on may tenth, 1966 at eleven thirty in the morning.