Navy Day is the original day to celebrate the U.S. Navy, and though this celebration officially was replaced by Armed Forces Day (Third Saturday in May for the U.S.) in 1949, the celebrations of Navy Day continue on, especially within the Navy itself. Additionally, research undertaken in the 1970s showed the ‘true’ birthday of the US Navy to be October 13th, and the date was officially changed – however, the entrenched celebration still holds sway, and October 27th is still generally celebrated instead.