On or around October 30, 1999, two craft where observed approximately 500 feet in the air 15 miles south of Tracy California.Peter, I will give you a brief background about my parents whom I sent you an email about there story earlier today. My father is retired, 68 years of age and was a heavy construction mechanic for 35 years. Dad designed and built numerous pieces of equipment used in the highway construction industry. Also, Dad is an atheist, no religious background of any kind! My mother, 62 years of age, was a part time cook and a full time mother, Catholic, and a strong belief in God. My parents live approximately 15 miles south of Tracy, California and have resided there for 22 years. They have a walnut orchard and it is located very close to interstate I-5 and Highway 132. On or around October 30, 1999, at about 8:00 p.m. both my parents where in the backyard sitting in their hot-tub. My mother looks to the south behind their orchard and observes two enormously large, what appeared to be circular objects with blinking red lights hovering approximately 500 feet in the air. The craft were spaced about 200 feet apart. They hovered in this position for between 60 and 90 seconds and there was no sounds at all heard coming from these craft. One craft then sped North over there home and the other went due East. When the craft left the area, they left at an unbeliveable speed, no sound what so ever heard, and the red lights that where observed changed to white when they departed. Both my parents are at a loss to explain what they witnessed and are even fearful to come forward to tell their story. They have never seen anything like this before and do not want to be percieved as crazy! But, this event forever changed their belief as to what may exist in our planet. They do not know if what they observed was alien, or, was some type of top secret military aircraft.