They move. But they don't play and move.
Every show, it's the same gimmick: a mic'd trumpet playing Arban runs blasted over front field speakers, while the corps fills in the field at 180 bpm. Looks cool. Almost convinces you that they're attempting simultaneous marching and playing. But they're not. At least, not at the level of Crown, or Bloo, or heck, even BAC this year.