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Yes, your US driver's license should suffice. When I checked in for my Scavi tour, I had the printed e-mail confirmation, handed it to the clerk, gave my name, and frankly, he didn't even request ID.
Thanks, I will have the printed email confirmations. Bruno at Eternal City Tours also said Driver's license is ok (incredibly patient man, have emailed him multiple times with questions!)
I did not need any identification for the Vatican. The Scavi tour asked for an ID just to check the booking, but I doubt they would have held us back if we hadn't brought it.