Nightmute & Barrow are the only two jobs currently listed in Alaska by UIC. All the rest are 4 in Virginia, 2 in Indiana, and 1 in S. Carolina. Odds are that it's 100% non-Alaska Native hire down there. Hunting whales is not one of the jobs offered, that's a local village hire.
ASRC does use the minority hire preference, but that isn't exclusively Alaska Natives. It includes all minorities. Guess what, in Barrow whites qualify for minority hire.
ASRC is not staunchly non-union. They're staunchly stay in business by making bids that won't eventually end up with expensive cost-overruns. Newer Federal regs are hard on companies that are in the habit of cost overruns. Many union companies can't escape that cycle because of union control. ASRC doesn't want to chance losing the privilege of bidding on government contracts.