It's The Anniversary Of D-Day
According to Business Insider, "It is the 75th anniversary of D-Day, the seaborne invasion of Nazi-occupied France that changed the course of World War II.
The Nazis suddenly had to fight a two-front war, and suffered divisions in their forces." Almost 5,000 landing and assault craft accompanied by 289 escort vessels and 277 minesweepers from Canada, the US, Britain, and Australia took part in the operation.
The Allies suffered 226,386 casualties, but it proved a decisive moment in the war.