Look, I don't agree with Billy Sheehan on this point - I thought it was 10 years, but generally Madman is right it's been around for a lot longer than just the public administration, and I've made my choice to get the full complement of shots and the booster - but honestly, I admire him. I haven't followed every one of his statements, but from my perspective, he made his decision, right or wrong, as is his right, he's accepting the consequences, as is his obligation, and he's not pushing his choice on other people, as is, in my opinion, his duty to other citizens.