Question: When was the man, whom the Taliban Five were exchanged for, released?

full_context: Document 1: Taliban Five: The Taliban Five were long-term Afghan detainees at Guantanamo Bay and formerly high-ranking members of the Taliban government of Afghanistan who, after being held indefinitely without charges, were exchanged for United States Army sergeant Bowe Bergdahl.
Document 2: Bagram torture and prisoner abuse: In 2005, "The New York Times" obtained a 2,000-page United States Army investigatory report concerning the homicides of two unarmed civilian Afghan prisoners by U.S. military personnel in December 2002 at the Bagram Theater Internment Facility (also "Bagram Collection Point" or "B.C.P.") in Bagram, Afghanistan and general treatment of prisoners. The two prisoners, Habibullah and Dilawar, were repeatedly chained to the ceiling and beaten, resulting in their deaths. Military coroners ruled that both the prisoners' deaths were homicides. Autopsies revealed severe trauma to both prisoners' legs, describing the trauma as comparable to being run over by a bus. Seven soldiers were charged in 2005.
Document 3: Kenneth Bowra: Kenneth Bowra is a retired major general who served in the US Army from 1970 to 2003. Bowra saw service with US special forces in the Vietnam War and Cambodian Civil War and has worked with the Central Intelligence Agency and Joint Special Operations Command. He later fought in the US Invasion of Grenada and in the Somali Civil War and First Gulf War. In 1998 he was given command of the John F. Kennedy Special Warfare Center and School and in 2000 was deputy commander of NATO's Kosovo Force. Retiring in 2003 he is now a diplomat with the US State Department in Saudi Arabia.
Document 4: Abdul Ghani Baradar: Mullah Abdul Ghani Baradar (Persian: عبدالغنی برادر; born c. 1968), also called Mullah Baradar Akhund or Mullah Brother, is a co-founder of the Taliban movement in Afghanistan. He was the deputy of Mullah Mohammed Omar. Baradar was captured in Pakistan by a team of Inter-Services Intelligence (ISI) and Central Intelligence Agency (CIA) in February 2010 and was released on 21 September 2013.
Document 5: Canadian Afghan detainee issue: The Canadian Afghan detainee issue concerns Government of Canada and/or the Canadian Forces (CF) knowledge of abusive treatment of detainees in Afghanistan. The abuse occurred after Afghans were detained by Canadian Forces, and subsequently transferred to the Afghan National Army (ANA) or the Afghan National Directorate of Security (NDS) during the War in Afghanistan. The issue has sparked heated debate since of the Third Geneva Convention (of which Canada is a signatory) states that "the Detaining Power [Canada] is responsible for the treatment given [to prisoners of war]". If the allegations of torture are true it would mean Canada is guilty of war crimes.
Document 6: Pat Tillman: Patrick Daniel Tillman (November 6, 1976 – April 22, 2004) was a professional American football player in the National Football League (NFL) who left his sports career and enlisted in the United States Army in June 2002 in the aftermath of the September 11 attacks. His service in Iraq and Afghanistan, and subsequent death, were the subject of much media attention.
Document 7: Brent Bennett: Brent Bennett is a former US Army paratrooper who was convicted by an Afghan court on 15 September 2004 for participating in torture and kidnapping, and for running a private jail in Kabul. Bennett and his associate Jonathan Idema had been operating as independent security contractors in Afghanistan, but had been representing themselves to the American and international media, members of the US military, and Afghan nationals as US government-sponsored covert operatives to track and apprehend Osama Bin Laden and senior Taliban officials. The government has repeatedly denied the validity of their claims.
Document 8: David Hicks: David Matthew Hicks (born 7 August 1975) is an Australian who was detained by the United States in Guantanamo Bay detention camp from 2001 until 2007. He had attended the Al Farouq training camp para-military training in Afghanistan during 2001.
Document 9: Nick Berg: Nicholas Evan "Nick" Berg (April 2, 1978 – May 7, 2004) was an American freelance radio-tower repairman who went to Iraq after the United States' invasion of Iraq. He was abducted and beheaded according to a video released in May 2004 by Islamist militants in response to the Abu Ghraib torture and prisoner abuse involving the United States Army and Iraqi prisoners. The CIA claimed Berg was personally murdered by Abu Musab al-Zarqawi. The decapitation video was released on the internet, reportedly from London to a Malaysian-hosted homepage by the Islamist organization Muntada al-Ansar.
Document 10: Pat Tillman: Patrick Daniel Tillman (November 6, 1976 – April 22, 2004) was a professional American football player in the National Football League (NFL) who left his sports career and enlisted in the United States Army in June 2002 in the aftermath of the September 11 attacks. His service in Iraq and Afghanistan, and subsequent death, were the subject of much media attention.
Document 11: Khairullah Khairkhwa: Khirullah Said Wali Khairkhwa is a Taliban official and former governor of Herat. He was held in the United States Guantanamo Bay detainment camp in Cuba. He was released in late May 2014 in a prisoner exchange that involved Bowe Bergdahl and the Taliban five. Press reports have referred to him as ""Mullah"" and ""Maulavi"", two different honorifics for referring to senior Muslim clerics.
Document 12: Bowe Bergdahl: Robert Bowdrie "Bowe" Bergdahl (born March 28, 1986) is a United States Army soldier who was held captive by the Taliban-aligned Haqqani network in Afghanistan and Pakistan after deserting his station from June 2009 until his release in May 2014. The circumstances under which Bergdahl went missing and how he was captured by the Taliban have since become subjects of intense media scrutiny.
Document 13: Robert Levinson: Robert Alan "Bob" Levinson (born March 10, 1948) is an American former Drug Enforcement Administration and Federal Bureau of Investigation agent who disappeared mysteriously in 2007 in Kish Island, Iran. He is believed to be currently held captive by the government of Iran. He disappeared on March 9, 2007, when visiting Iran's Kish Island while supposedly researching a cigarette smuggling case. U.S. officials believed Levinson had been arrested by Iranian intelligence officials to be interrogated and used as a bargaining chip in negotiations with Washington. But as every lead fizzled and Iran repeatedly denied any involvement in his disappearance, many in the U.S. government believed Levinson was probably dead. He was subsequently revealed to be alive. On December 12, 2013, the Associated Press reported that their investigations revealed that Levinson had been working for the Central Intelligence Agency (CIA), contradicting the U.S.'s statement that he was not an employee of the government at the time of his capture.
Document 14: Korey Rowe: Korey Rowe is a producer of "Loose Change 9/11: An American Coup", a film by Dylan Avery. Rowe was born in Oneonta, New York and currently lives in Long Beach, CA. He is a former US soldier who served six months in Kandahar, Afghanistan and one year in Kuwait and Iraq. Rowe enlisted in the 101st Airborne Division in August 2001 and left in June 2005, then joining the production of "Loose Change". On July 23, 2007, he was arrested at his home in Oneonta, New York, based on a military warrant charging him with felony desertion. Two days later he was returned to his unit at Fort Campbell, Kentucky, although he states that he received an honorable discharge and returned to uniform of his own accord, and that he is attempting to expunge his name completely from the system. Rowe would later post scans of his certificate of honorable discharge from the U.S. Army on his blog.
Document 15: Mohammad Ghous: Mullah Mohammad Ghous (born 1961?) was among the leadership of the Taliban which ruled Afghanistan from 1996 to 2001. He served as foreign minister of Afghanistan from September 1996, when the Taliban captured Kabul until June 1997, when he and some other Taliban leaders were kidnapped by opposition forces at Mazar-i-Sharif in the northern part of the country. Ghous reportedly escaped in September 1997 when the Taliban captured that city, but he was not reappointed as foreign minister, and his whereabouts since then are not well known.
ground_truth: May 2014