It's Victory over Japan Day (V-J Day, also known as Victory in the Pacific Day, or V-P Day).
It is the day on which the Surrender of Japan occurred, effectively ending World War II, and subsequent anniversaries of that event. The term has been applied to both the day on which the initial announcement of Japan's surrender was made in the afternoon of August 15, 1945 as well as the date the formal surrender ceremony was performed in Tokyo Bay, aboard the battleship U.S.S. Missouri on September 2, 1945.
Did you see the picture of the sailor and the nurse, well that happened on V-J day.
In Japan, the day is usually known as Shuusen-kinenbi, which literally means the "memorial day for the end of the war"; the official name for the day is however "the day for mourning of war dead and praying for peace".
Victory Day, also known as VJ Day, marks the anniversary the Allies’ victory over Japan during World War II. It followed the dropping of the devastating atomic bomb on the Japanese cities of Hiroshima on August 6 and Nagasaki on August 9, 1945. Victory Day is a state holiday in Rhode Island in the United States on the second Monday each year.
There have been many arguments and debates concerning the nature and name of this holiday. Veteran groups and their supporters observe Victory Day on the second Monday of August each year. Events may include a commemorative ceremony for veterans. Many people believe that there is a need for such a day to remember the sacrifices that veterans made during World War II, including those who were taken as prisoners of war, were tortured, injured or killed.
However critics claim that the day itself is discriminatory due to its reference to Japan in light of modern times. There have been many attempts to change the holiday’s name but so far it remains to be known as Victory Day. Nonetheless there are people who hope to one day celebrate the holiday under a new name or educate young Americans more about the Japanese culture in modern society.