No not all of them. Being chair? Maybe, but not even all of them for that. Be engaged. Get your name out there, be on the other forums, go to pickets, offer to help and introduce yourself to prior already on committees. I agree that it's not necessarily easy to get on committees, but nor will it ever be with 11-12k pilots. If all you're doing is putting in an email when swapa sends out an email asking for volunteers, you're probably not going to get selected.

Comms, strike, jumpseat, sac: all committes who have solicited volunteers in the last 12-18 months.