1993. This year is why I'm a drum corps fan. And this show is why I've always been a Regiment fan. Very different pieces of music arranged to fit together perfectly, and oozing GE that DEMANDED three standing Os (something they haven't had in a while).
1996. My first drum corps show to see live was in Tulsa that summer, though rain forced Regiment indoors - still incredible. Visual minimalism that wouldn't be competitive today and was even pretty different back then, but it worked so well.
2005. Freaking toe tapper, with some "aren't they too stiff?" jam. First year with Jamey Thompson and Adam Sage, with greatly improved performances in brass and percussion.
2007. Great concept, especially visually. As others have said, I wish they would've gone with a different closer, but still a great show.
For the fifth show, several stand out to me for different reasons: 1995, 2006, 2010
Dishonorable mention: 2016. Couldn't be more disappointed for an anniversary year.