What kind? If you've seen hundreds of launches then what kind of missile did it resemble? Not shoulder launched would seem to indicate that it needed a launcher platform of some kind, wouldn't it?
At the time, I thought it looked very similar to an AIM-9. But 12 years later, I wouldn’t bet my career on it unless I had access to the video for analysis.
I’m not saying it WAS an AIM-9, I’m saying it had similar characteristics which gave me a sense of the Chaparral launches I’ve seen.