1. In 1910, Guthrie, Oklahoma was devastated by a massive tornado that killed 23 people and caused extensive damage to the town. The tornado hit on June 18, and it remains one of the deadliest tornadoes in Oklahoma history.

2. On June 18, 1873, Indian Territory was officially created by the U.S. government. This territory would eventually become the state of Oklahoma in 1907.

3. In 1947, the United States Air Force began conducting secret tests in which they released nuclear bombs from planes over the Yucca Flat area of the Nevada Test Site. The first test, known as Operation Crossroads, took place on June 18.

4. In 2002, Oklahoma City hosted the Women's College World Series for softball. The event lasted several days and was won by the UCLA Bruins.

5. On June 18, 1977, American astronaut Bruce McCandless II made history by performing the first untethered spacewalk. McCandless used a Manned Maneuvering Unit to move away from the space shuttle, making him the first person to ever float in space without being attached to a spacecraft.