Bright green object in flight allmost colided with my aircraft.

Pilot ATP 767 enroute at FL370 near Nelis AFB east bound.A very very bright green round object moving at an extraordinary speed came within 100 to 150 feet from my cockpit window as it changed its trajectory at the last posible second to avoid a collision. The craft was not of a design that I could identify and I could not see any type of propulsion system also missing were any type of navigational lights or light beacon lights wich are required by law of all aircraft.The rapid change in trajectory indicated that the object was under positive control.The maneuvering ability the object demonstrated to avoid our conflicting flight paths was....well I was impressed; the maneuver would have been enough to structuraly compromise all conventional aircraft and probably kill any occupants.In other words it would rip a 767 into pieces.The object was gone from sight as it flew north and descended.
Date in October 1994 is approximate.  Source is anonymous.  We would very much like to correspond with this person to establish a more accurate date, if possible.  His flight logs might permit a very accurate determination of the date and time of the incident.  We would like to be able to compare his report with other reports we received at about that time, and before we had computerized out data system, and before we had created a website.  Many of our reports are not processed and posted.  PD