One evening about an hour after sundown in 1972, approximately half-way between Rensselaer and Francesville, Indiana, an elderly friend and I were outside talking together when we stopped to observe a lighted object flying a northwesterly course passing directly over our position. We first thought it was a commercial jet, but we heard no engine sound at all. I estimate the altitude to have been fifteen to twenty thousand feet. About the time the object was directly overhead, we heard what sounded like a military aircraft in hot pursuit. Its rate of closure was fast enough that it was about to overtake the silent object. We stood transfixed as the silent object made a precise 90 degree turn to the southwest and accelerated OUT OF SIGHT in no more than two seconds, leaving the military aircraft helplessly behind. We watched for a short time after that, but nothing else happened. That is all we saw. I verbally verified it with my elderly friend to be sure we both saw the same event.