This is fun!: http://www.nicap.org/640515whitesands_dir.htm
We did interview the communications chief at stallion site who was there in this time frame. He said that UFOs were routinely encountered on the White Sands Range so much so that they were ignored after several calls to interceptors to chase them away. He also said some tests were delayed or cancelled due to unknown objects or radar returns on the range....he didn't have any detail cases in mind just the general information that things that weren't suppose to be there were detected. Some felt it was Soviet spies, but no interceptions were succcessful."