Brazilian Navy Commemoration Day, observed nationwide on June 11, celebrates the anniversary of the Battle of the Riachuelo, which took place on June 11, 1865, during the Paraguayan War. This battle marked a significant turning point in favor of the Triple Alliance, consisting of Brazil, Uruguay, and Argentina, against Paraguay. The day is recognized as a tribute to the Brazilian Navy, which has a reported strength of 112 ships, 81 aircraft, and 60,000 active personnel, including 15,000 marines. Events typically include military displays and various activities that honor the naval service branch of the Brazilian Armed Forces. The largest vessel in the Brazilian Navy is the NAe São Paulo, a 32,800-ton Clemenceau-class aircraft carrier commissioned in 2000. The commemoration highlights the importance of naval history and military achievements in Brazil.