Question: The 2009 Fort Hood mass shooting was committed by who?

Documents:
source: Nidal Hasan
text: Nidal Hasan Nidal Malik Hasan (born September 8, 1970) is an American convicted of fatally shooting 13 people and injuring more than 30 others in the Fort Hood mass shooting on November 5, 2009. Hasan was a United States Army Medical Corps psychiatrist who admitted to the shootings at his court-martial in August 2013. A jury panel of 13 officers convicted him of 13 counts of premeditated murder, 32 counts of attempted murder, and unanimously recommended he be dismissed from the service and sentenced to death. Hasan is incarcerated at the United States Disciplinary Barracks at Fort Leavenworth in Kansas awaiting execution while his case is reviewed by appellate courts.

source: 2009 Fort Hood shooting
text: 2009 Fort Hood shooting On November 5, 2009, a mass shooting took place at Fort Hood, near Killeen, Texas. Nidal Hasan, a U.S. Army major and psychiatrist, fatally shot 13 people and injured more than 30 others. The shooting was the worst mass shooting on an American military base.

source: Killeen–Fort Hood Regional Airport
text: Killeen–Fort Hood Regional Airport Killeen–Fort Hood Regional Airport (IATA: GRK, ICAO: KGRK, FAA LID: GRK) is a small military/commercial joint-use airport that operates alongside Robert Gray Army Airfield. The airport is based inside the south end of the Fort Hood Military Reservation (known as West Fort Hood), six nautical miles (7 mi, 11 km) southwest of the central business district of Killeen, Texas, in unincorporated Bell County. The commercial side replaced the old Killeen Municipal Airport (now Skylark Field), which was unable to expand.

source: Robert Gray Army Airfield
text: Robert Gray Army Airfield Robert Gray Army Airfield (IATA: GRK, ICAO: KGRK, FAA LID: GRK) is a military joint-use airport that operates alongside Killeen–Fort Hood Regional Airport. The airport is based inside the south end of the Fort Hood Military Reservation (known as West Fort Hood), six nautical miles (7 mi, 11 km) southwest of the central business district of Killeen, Texas, in unincorporated Bell County.

source: Michael Mulligan
text: Michael Mulligan Colonel Michael Mulligan is a prosecutor in the United States Army notable for serving as the lead prosecutor in the courts-martial of Hasan Akbar and of Nidal Malik Hasan, the sole accused in the November 2009 Fort Hood shooting.

source: Mass shooting
text: Mass shooting A mass shooting is an incident involving multiple victims of firearms-related violence. The United States' Congressional Research Service acknowledges that there is not a broadly accepted definition, and defines a "public mass shooting" as one in which four or more people selected indiscriminately, not including the perpetrator, are killed, echoing the FBI definition of the term "mass murder". Another unofficial definition of a mass shooting is an event involving the shooting (not necessarily resulting in death) of four or more people with no cooling-off period. Related terms include school shooting and massacre. The lack of a single definition can lead to alarmism in the news media, with some reports conflating categories of crimes.

source: Under the Hood Café
text: Under the Hood Café Under the Hood Café was a coffee house located at 17 South College Street in Killeen, Texas. It provided services for soldiers located at Fort Hood, one of the largest American military installation in the world. Under the Hood Café was first managed by Cynthia Thomas, but later managers were Kyle Wesolowski, Lori Hurlebaus and Malachi Muncy. Under the Hood is a project of the Fort Hood Support Network. It bills itself as being a safe place for local soldiers to spend off-duty time at, where the normal issues of rank are irrelevant. It is also the host of the monthly Killeen Poetry Slam.

source: West Fort Hood
text: West Fort Hood West Fort Hood is an underground weapons storage area adjacent to Fort Hood in Texas. Originally built in the late 1940s by the United States Air Force, it was adjacent to Gray Air Force Base. On 15 June 1963 Killeen Base was turned over to the Army, and in October 1969, Killeen Base was designated as West Fort Hood and the airfield's name was designated as Robert Gray Army Airfield. It is also home to the Army Operational Test Command.

source: 3rd Weather Squadron
text: 3rd Weather Squadron The 3rd Weather Squadron (3 WS) is a unit of the United States Air Force. It was formed at Barksdale Field (now Barksdale Air Force Base), Louisiana, on 24 June 1937, as part of the Signal Corps. The 3rd was one of three original squadrons that eventually transferred from the Signal Corps to the Air Corps. Currently located at West Fort Hood, the 3rd Weather Squadron is aligned under the 3rd Air Support Operations Group. Weather support to Fort Hood began in 1947 at the newly constructed Killeen AFB. Today, the 3rd Weather Squadron—in addition to providing weather support to the Fort Hood complex—has operating locations at Forts Bliss, Huachuca, Riley, and Sill in Texas, Arizona, Kansas, and Oklahoma, respectively.

source: 720th Military Police Battalion
text: 720th Military Police Battalion The 720th Military Police Battalion is a military police battalion of the United States Army based at Fort Hood, Texas. It is a subordinate unit under the Training and Readiness Authority of the 89th Military Police Brigade. Constituted 10 Jan. 1942 in the Army as the 720th Military Police Battalion, it was activated during the Second World War at Fort Meade, MD 20 Jan 1942. The battalion served during that time while stationed in Australia and New Guinea. From there it was relocated to Yokohama, Japan in 2 Sep 1945 until finally moved to Fort Hood, Texas on 21 Feb, 1955.

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Answer: Nidal Hasan