Howieh, thanks for looking.
The shots were taken in August during Op BOXTOP, a biannual resupply mission to CFS Alert on northern Ellesmere Island as you indicated. This was the first Op BOXTOP that utilised C-17's in its entirety, as opposed to the venerable Hercules.
The mission, 24 hours of daylight, arctic wolves, hares, fox, and a tonne of birds made for a great stay and several feature articles in the works.