A U.S. Air Force B-52H Stratofortress receives fuel from a New Hampshire Air National Guard KC-135R Stratotanker near the eastern coast of Canada, April 2, 2015. The B-52H was returning home after supporting Polar Growl, a U.S. Strategic Command-directed mission to the Arctic and North Sea regions. The B-52H Stratofortress is assigned to Barksdale Air Force Base, La.