You are wrong sir, The Empire Statesmen use G bugles in the line. The only player who has used a Bb or C instrument to my knowledge is Joey Pero... and why not, he would sound good on a garden hose.
I marched Contra in 2006, they are the Dynasty 5/4 model 4 valve G bugles. In no way are those horns Bb.
Like Kris said, they are some heavy SOB's... I believe something like 30 pounds or so.