To jkp653 - re. adding alternates to a permit. Last year I had a permit for 2 in my name, and was able to call in weeks later and add an alternate leader name (that I had neglected to add at the time I booked it) so that person could pick it up and I didn't have to be there. I think as long as a named person on the permit picks it up, the rangers do not ask for the names of everyone on the trip.