Are you even allowed to use treble clef in the US? because over this direction (Scotland to be specific) the biggest exam board allow you to use treble or bass in a variety of keys.
I might have been a bass clef man had I started on the tuba, but I started on the tenor horn, which is definately TC.
What usually happens with the band I'm in I either get given a treble clef Eb bass part (treble clef), or a C tuba part in bass clef (the norm I believe) this suits me fine as on an Eb tuba I can read the bass clef as treble and add 3 sharps (and adjust accidentals accordingly) and it pitches right.
I have no intention of emigrating so I'm OK in that respect.