1920

Vancouver Barracks, located near Vancouver, Washington, was the first American military post in the Pacific Northwest. It was established by the U.S. Army in May of 
1849 and was originally named Columbia Barracks. The installation remained the
oldest military installation (in continual operation), west oft the Mississippi river,
until it was forced to close by the Defense Department in the summer of 2011. 

1907

1909

Ethel Greenglass Rosenberg (37) and Julius Rosenberg (35) were
American communists who were convicted for conspiracy to commit
espionage during a time of war. Their charges were related to the
passing of secret information about the atomic bomb to the Soviet
Union when they were employees of the Los Alamos atomic bomb
project. They were both executed in the electric chair on June 19,
1953. This was the first execution of civilians for espionage in U.S.
history

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The space probe Mariner 10 became the first spacecraft to reach the planet
Mercury. It had been launched on November 3, 1973.The first encounter took
place at a range of 437 miles, passing on the shadow side of the planet. The
probe flew by Mercury again on September 21, 1974. Mariner 10 is still orbiting
the Sun, although its electronics have probably been damaged by the Sun’s
radiation.

Mercury, 6 hours before closest approach of Mariner 10

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  Denton True "Cy" Young (March 29, 1867 – November 4, 1955)

Major League Baseball pitcher Cy Young played with five different
teams during his 22-year career (1890-1911). He was elected to the
National Baseball Hall of Fame in 1937. Young completed 511 wins,
and still holds the Major League records for most career innings
pitched at 7,355, most career games started, 815, and most
completed games, 749. 

One year after Young’s death, the Cy Young Award was created
to honor the previous season’s best pitcher.The award is given
annually to honor the best pitchers in both the American League
and the National League teams