1. The Battle of Chantilly: On September 30, 1862, the Battle of Chantilly was fought near the town of Chantilly in Fairfax County, Virginia. This was a significant battle of the Civil War, as it marked the end of the Second Battle of Bull Run and resulted in heavy casualties for both sides.

2. Virginia becomes a state: On September 30, 1783, Virginia became the tenth state to ratify the Articles of Confederation, which established the United States as a confederation of sovereign states. Virginia played a key role in the formation of the United States, as it was one of the original thirteen colonies and its capital, Richmond, served as the capital of the Confederacy during the Civil War.

3. West Virginia admitted to the Union: On September 30, 1861, President Abraham Lincoln issued a proclamation admitting West Virginia as the thirty-fifth state in the Union. West Virginia seceded from Virginia in 1861 during the Civil War in protest of Virginia's decision to join the Confederacy.

4. NASA Langley Research Center founded: On September 30, 1917, the National Advisory Committee for Aeronautics (NACA) established the Langley Memorial Aeronautical Laboratory in Hampton, Virginia. This facility was later renamed the NASA Langley Research Center and became a major center for aeronautical research and development.

5. Virginia Tech shooting: On September 30, 2007, a mass shooting occurred at Virginia Polytechnic Institute and State University (Virginia Tech) in Blacksburg, Virginia. The shooting, which was carried out by a lone gunman, resulted in the deaths of 32 people and injured 17 others. It remains the deadliest school shooting in the history of the United States.