Merchant Navy Day is observed every September 3 in Great Britain and Canada, serving as a memorial day to honor the contributions and sacrifices of merchant seafarers during World War I and II. The British Merchant Navy faced significant losses from German U-boat attacks, with approximately 32,000 seafarers killed, while successfully supporting the Allied victory through vital supply convoys. The Canadian Merchant Navy, established in 1939, played a crucial role in the Battle for the Atlantic, aiding its British counterpart during a time of high casualties. This day was officially recognized in Great Britain in 2000, transitioning from Remembrance Day observances, and Canada followed suit in 2001 by designating September 3 as Merchant Navy Remembrance Day. Activities typically include memorial services and events to commemorate the bravery and sacrifices of those who served in the merchant navy.