I know that from the UMass drumline itself, this summer there were 11 marching Cadets, 4 at Crown, 1 at Madison, 1 at Crossmen, a handful at Spartans, 1 at Bucs and several others. And that's not mentioning the amount of current or former UMass drumline members on staff at many corps across the country - dozens just between Cadets and Crown.
Thom Hannum's reach in this activity is incredible!