Question: When did the war that is the main subject of Soldier Five begin?

full_context: Document 1: The Good Soldiers: The Good Soldiers (2009) is a non-fiction book about the 2007 troop surge in Iraq written by David Finkel, chronicling the deployment of 2nd Battalion, 16th Infantry Regiment of the 4th Infantry Brigade Combat Team, 1st Infantry Division, nicknamed "Rangers", under the command of Lieutenant Colonel Ralph Kauzlarich. The story follows Kauzlarich as he experiences the reality of war, and loses soldiers for the first time.
Document 2: Douglas A. Zembiec: Major Douglas Alexander Zembiec (April 14, 1973 – May 11, 2007), the "Lion of Fallujah" and also referred to as the "Unapologetic Warrior" was an officer in the United States Marine Corps and member of the CIA's Special Activities Division's Ground Branch who was killed in action while serving in Operation Iraqi Freedom. He is best known for his actions during Operation Vigilant Resolve, which were detailed in the book "No True Glory: A Front-line Account of the Battle of Fallujah" by Bing West and for an article that ran in the "Wall Street Journal" following his death.
Document 3: Military history of the United States: The War on Terrorism is a global effort by the governments of several countries (primarily the United States and its principal allies) to neutralize international terrorist groups (primarily Islamic Extremist terrorist groups, including al-Qaeda) and ensure that countries considered by the US and some of its allies to be Rogue Nations no longer support terrorist activities. It has been adopted primarily as a response to the September 11, 2001 attacks on the United States. Since 2001, terrorist motivated attacks upon service members have occurred in Arkansas and Texas.
Document 4: The Things They Carried: The Things They Carried (1990) is a collection of linked short stories by American novelist Tim O'Brien, about a platoon of American soldiers fighting on the ground in the Vietnam War. His third book about the war, it is based upon his experiences as a soldier in the 23rd Infantry Division.
Document 5: War on Terror: On 14 September 2009, U.S. Special Forces killed two men and wounded and captured two others near the Somali village of Baarawe. Witnesses claim that helicopters used for the operation launched from French-flagged warships, but that could not be confirmed. A Somali-based al-Qaida affiliated group, the Al-Shabaab, has confirmed the death of "sheik commander" Saleh Ali Saleh Nabhan along with an unspecified number of militants. Nabhan, a Kenyan, was wanted in connection with the 2002 Mombasa attacks.
Document 6: Gulf War: The war is also known under other names, such as the Persian Gulf War, First Gulf War, Gulf War I, Kuwait War, First Iraq War or Iraq War, before the term ``Iraq War ''became identified instead with the 2003 Iraq War (also referred to in the US as`` Operation Iraqi Freedom''). The Iraqi Army's occupation of Kuwait that began 2 August 1990 was met with international condemnation and brought immediate economic sanctions against Iraq by members of the UN Security Council. US President George H.W. Bush deployed US forces into Saudi Arabia, and urged other countries to send their own forces to the scene. An array of nations joined the coalition, the largest military alliance since World War II. The great majority of the coalition's military forces were from the US, with Saudi Arabia, the United Kingdom and Egypt as leading contributors, in that order. Kuwait and Saudi Arabia paid around US $32 billion of the US $60 billion cost.
Document 7: War on Terror: Following the ceasefire agreement that suspended hostilities (but not officially ended) in the 1991 Gulf War, the United States and its allies instituted and began patrolling Iraqi no-fly zones, to protect Iraq's Kurdish and Shi'a Arab population—both of which suffered attacks from the Hussein regime before and after the Gulf War—in Iraq's northern and southern regions, respectively. U.S. forces continued in combat zone deployments through November 1995 and launched Operation Desert Fox against Iraq in 1998 after it failed to meet U.S. demands of "unconditional cooperation" in weapons inspections.
Document 8: Gulf War: The next targets were command and communication facilities. Saddam Hussein had closely micromanaged Iraqi forces in the Iran–Iraq War, and initiative at lower levels was discouraged. Coalition planners hoped that Iraqi resistance would quickly collapse if deprived of command and control.
Document 9: Bravo Two Zero (film): Bravo Two Zero is a 1999 two-hour television miniseries (broadcast in two parts between 3 and 4 January in the UK), based on the book of the same name by Andy McNab. The film covers real life events – from the perspective of Andy McNab, patrol commander of Bravo Two Zero, a British SAS patrol, tasked to find Iraqi Scud missile launchers during the Gulf War in 1991. The names of the patrol members killed were changed.
Document 10: War on Terror: Support for the U.S. cooled when America made clear its determination to invade Iraq in late 2002. Even so, many of the "coalition of the willing" countries that unconditionally supported the U.S.-led military action have sent troops to Afghanistan, particular neighboring Pakistan, which has disowned its earlier support for the Taliban and contributed tens of thousands of soldiers to the conflict. Pakistan was also engaged in the War in North-West Pakistan (Waziristan War). Supported by U.S. intelligence, Pakistan was attempting to remove the Taliban insurgency and al-Qaeda element from the northern tribal areas.
Document 11: Black Hawk Down (book): Black Hawk Down: A Story of Modern War is a 1999 book by journalist Mark Bowden. It documents efforts by the Unified Task Force to capture Somali faction leader Mohamed Farrah Aidid in 1993, and the resulting battle in Mogadishu between United States forces and Aidid's militia. One of the key events is the downing of two United States UH-60 Black Hawk helicopters, from which the book derives its title, and the attempt to rescue their crews. United States forces included Army Rangers, 160th Special Operations Aviation Regiment, 10th Mountain Division, Delta Force and Navy SEALs, with United Nations peacekeeping forces also involved.
Document 12: Soldier Five: Soldier Five – The Real Truth About the Bravo Two Zero Mission is the third book about the Bravo Two Zero mission during the Gulf War to have been written by a member of the eight-man patrol involved.
Document 13: Military history of the United States: After the lengthy Iraq disarmament crisis culminated with an American demand that Iraqi President Saddam Hussein leave Iraq, which was refused, a coalition led by the United States and the United Kingdom fought the Iraqi army in the 2003 invasion of Iraq. Approximately 250,000 United States troops, with support from 45,000 British, 2,000 Australian and 200 Polish combat forces, entered Iraq primarily through their staging area in Kuwait. (Turkey had refused to permit its territory to be used for an invasion from the north.) Coalition forces also supported Iraqi Kurdish militia, estimated to number upwards of 50,000. After approximately three weeks of fighting, Hussein and the Ba'ath Party were forcibly removed, followed by 9 years of military presence by the United States and the coalition fighting alongside the newly elected Iraqi government against various insurgent groups.
Document 14: Gulf War: The Gulf War (2 August 199028 February 1991), codenamed Operation Desert Shield (2 August 199017 January 1991) for operations leading to the buildup of troops and defense of Saudi Arabia and Operation Desert Storm (17 January 199128 February 1991) in its combat phase, was a war waged by coalition forces from 35 nations led by the United States against Iraq in response to Iraq's invasion and annexation of Kuwait arising from oil pricing and production disputes. The war is also known under other names, such as the Persian Gulf War, First Gulf War, Gulf War I, Kuwait War, First Iraq War or Iraq War, before the term "Iraq War" became identified instead with the post-2003 Iraq War.
Document 15: Gulf War: The Gulf War (2 August 1990 -- 28 February 1991), codenamed Operation Desert Shield (2 August 1990 -- 17 January 1991) for operations leading to the buildup of troops and defense of Saudi Arabia and Operation Desert Storm (17 January 1991 -- 28 February 1991) in its combat phase, was a war waged by coalition forces from 35 nations led by the United States against Iraq in response to Iraq's invasion and annexation of Kuwait.
ground_truth: 1991
sub_queries: Soldier Five >> main subject Answer: Gulf War
When did the first Gulf War begin? Answer: 1991