small,craft very high flying a square wave pattern from horizon to horizon east to west

it was a small white lite very high in the nighttime sky. I presuned that the light was actually the rocket exhaust. the craft was traveling VERY fast. I t was flying a square wave pattern and there was no sound another reason that I thought that it as very high, probably beyond the atmosphere. We watched it travel from East to west fro about 160 degrees of the sky. I have always wondered what it was I'm not saying that I think it was extraterrestials. The government has a lot of bases in that part of the country I just thought that maybe you know what ti was that I saw.
Date is approximate.  We do not know what caused the incident.  We will inquire as to what a "square wave pattern" is.  PD