ANC is not an official base. You can live wherever you want but you must designate a gateway somewhere that is approved in the lower 48. You would be responsible for getting yourself to and from SEA or PDX if that is what you designated. It is possible to request alternate travel at the end of your rotation and request a ticket to ANC in lieu of SEA (or whatever base you designate). The ticket price would have to be the same or less for them to approve.

Also, all the lines start the first day with short call (2 hour call out) from your designated gateway. You would have to get yourself in position and be available in case you are called for a trip or a random drug/alcohol test. So you'd possibly need to fly down the day before and would need a place to stay on your own dime.