April 11th
National Submarine Day

National Submarine Day is celebrated annually on April 11th in the United States. The day commemorates the anniversary of the commissioning of the first military submarine, the USS Holland, on April 11th, 1900. The purpose of this day is to honor the achievements and sacrifices of the men and women who have served in the United States Submarine Force, and to recognize the vital role that submarines have played in military operations throughout history. On National Submarine Day, people may participate in various activities and events that celebrate the submarine force, such as visiting naval museums or attending submarine-related exhibitions or displays. They may also honor the memories of those who have served in the submarine force by laying wreaths or participating in other commemorative ceremonies. The day also serves as an opportunity to educate people about the history and technology of submarines, and the important role they continue to play in modern warfare and defense. It highlights the bravery and dedication of the submarine crews who operate in challenging and dangerous environments, often for extended periods of time.