Because I am petty:
U20 team: Blaze, Duke, Henckel, Mirasola, Mirasola.
U23 team: Lilledahl, Blaze, Duke, Mesenbrink, Haines, Welsh, Barr.
Now, I wasn't a physics major, nor am I or a rocket surgeon, but I think that is 50% and 70% of the U20 and U23 teams, respectively.