Not to hijack this thread, but man... I LOVED watching those things fire. BBBBBBRRRRRRRPPPP!
Were you in a vulcan?
I've developed thread hijacking to a very high level.
I was in a composite Towed Vulcan/Chaparral battalion in Germany. Our mission was air base defense. During my 4 year tour, I was a platoon leader for both systems, followed by maintenance officer, Assistant S-3, and finished up as the S-4.
I loved almost every minute, save for my 6 months as maintenance officer.
The advantage Chaparral had over the Vulcans was the location of Annual Service Practice: Crete vs. Todendorf. Northern Germany is unbelievably frigid during February, although summer ASP was ok.