I was standing in by backyard, just past twilight, stargazing, when I noticed a large chevron shaped formation of lights, traveling from East to West at 30,000 or so feet and at a speed in excess of Mach 2.

I was standing in my backyard, just past twilight, stargazing, when I noticed a large chevron shaped formation of lights, traveling from East to West at 30,000 or so feet and at a speed in excess of Mach 2.  
I'll preface the above statement by the fact I live near a military airbase and see many aircraft daily. However, this "aircraft" was not flying and/or adhering to any of the air traffic patterns or speeds I was accustomed to.  
I will also add that the pattern of lights (they were white)I mentioned, which seemingly defined the object(s) leading edge, did not blink or even appear to twinkle due to any atmospheric distortion (it was a very clear night though). 
Furthermore, I never heard a sound. In summary, what I saw is the first and only thing I've ever seen in flight, in thirty plus years, that I can say without hesitation, I don't know what it was.  In fact, I only came across this site trying to find some information for a friend who is interested in UFOs.  
And, what led me to doing this posting is that in looking through the data, out of curiosity I looked back to 1994 to see if anyone had posted a sighting similar to mine.  
Well, lo and behold, I found a Riverside, CA, event on 10/11/94 in which the description of the object (chevron), with the farmost lights from center offset a bit) matches what I saw in 8/94 in San Diego, perfectly.