NORTH ATLANTIC OCEAN -- (L to R) Petty Officer 3rd Class Trent Lamun. a Damage Controlman, Ens. Paul Rigez and Seaman Andrew Walz of the Coast Guard Cutter Alder are given a tour of the Canadian Navy vessel HMCS Goose Bay by Canadian Petty Officer 2nd Class Leif Grinstead, during a shiprider exchange, July 28, 2010. Alder is underway as part of Operation Nanook, one of three major operations conducted per year in the Canadian Arctic, designed to demonstrate international cooperation and expand the international ability to respond to emergencies in the Arctic. (U.S. Coast Guard photo by Petty Officer 3rd Class George Degener).