1970 — In Laos the US Operation Tailwind began with the objectives of reconnaissance, intelligence collection, and a diversion for a larger operation to the north. In 1998 it was reported that the secret raid called Operation Tailwind by a Special Forces unit called the Studies and Observations Group (SOG) used the nerve gas, Sarin, in Laos to kill American armed service members who had defected. A report in 1998 allegedly confirmed that over 100 people were killed including up to 20 American military defectors. Adm. Thomas Moorer, the chairman of the Joint Chiefs of Staff at the time (1970-1974), confirmed in 1998 that nerve gas was used. CNN and Time magazine later recanted the story due to insufficient evidence.
2001 — The September 11 attacks, a series of coordinated suicide attacks killing 2,996 people using four aircraft hijacked by 19 members of al-Qaeda. Two aircraft crash into the World Trade Center in New York City, a third crashes into The Pentagon in Arlington County, Virginia, and a fourth into a field near Shanksville, Pennsylvania.