These are photos, obtained by WikiLeaks that match the names of the detainees released by the Department of Defense. The Department of Defense would neither confirm nor deny their accuracy. Khair Ulla Said Wali Khairkhwa was an early member of the Taliban in 1994 and was interior minister during the Taliban's rule. He was arrested in Pakistan and was transferred to Guantanamo in May 2002. During questioning, Khairkhwa denied all knowledge of extremist activities. 
Mullah Mohammad Fazl commanded the main force fighting the U.S.-backed Northern Alliance in 2001, and served as chief of army staff under the Taliban regime. Fazl was detained after surrendering to Abdul Rashid Dostam, the leader of Afghanistan's Uzbek community, in November 2001. He was transferred into U.S. custody in December 2001 and was one of the first arrivals at Guantanamo, where he was assessed as having high intelligence value. 
Mullah Norullah Noori served as governor of Balkh province in the Taliban regime and played some role in coordinating the fight against the Northern Alliance. Like Fazl, Noori was detained after surrendering to Dostam, the Uzbek leader, in 2001. 
Abdul Haq Wasiq was the deputy chief of the Taliban regime's intelligence service. Wasiq claimed, according to an administrative review, that he was arrested while trying to help the United States locate senior Taliban figures. He denied any links to militant groups. 
Mohammad Nabi Omari was a minor Taliban official in Khost Province and was the Taliban's chief of communications and helped al Qaeda members escape from Afghanistan to Pakistan. He also said that he had worked with a U.S. operative named Mark to try to track down Taliban leader Mullah Omar.
- About 17% of Gitmo detainees return to terrorist activities, report says
- As of last month, the Guantanamo Bay detention facility had 154 detainees
- Not everyone at Guantanamo Bay has been found guilty of terrorism
(CNN) -- Guantanamo Bay detainees have long been considered America's most dangerous enemies.
So what happens when they walk free -- like the five detainees swapped for U.S. Army Sgt. Bowe Bergdahl?
Do they return to terror activities or transition to quiet, private lives away from the mayhem?
Well, it's a mixture of both.
How dangerous is this latest swap?
Video released of Bergdahl's transfer 
What happened when Bergdahl disappeared? 
'It matters a lot if he was a deserter' 
This undated image provided by the U.S. Army shows Sgt. Bowe Bergdahl, who has been held by insurgents in Afghanistan since 2009. The White House announced Bergdahl's release on Saturday, May 31. 
An Iranian court threw out a 2011 death sentence for Amir Hekmati, a former U.S. Marine charged with spying. But he was secretly retried in Iran and convicted of "practical collaboration with the U.S. government," his sister told CNN on Friday, April 11. He has been sentenced to 10 years in prison, she said. Hekmati was detained in August 2011 during a visit to see his grandmother. His family and the Obama administration deny accusations he was spying for the CIA. 
A North Korean court sentenced Kenneth Bae, a U.S. citizen, to 15 years of hard labor for committing "hostile acts" against the state. Those alleged acts were not detailed by the country's state-run news agency when it announced the sentence in May. Bae, here in a photo from a Facebook page titled Remember Ken Bae, was arrested in November 2012. "This was somebody who was a tour operator, who has been there in the past and has a visa to go to the North," a senior U.S. official told CNN. 
Retired FBI agent Robert Levinson has been missing since 2007. His family says he was working as a private investigator in Iran when he disappeared, and multiple reports suggest Levinson may have been working for the CIA. His family told CNN in January that they have long known that Levinson worked for the CIA, and they said it's time for the government to lay out the facts about Levinson's case. U.S. officials have consistently denied publicly that Levinson was working for the government, but they have repeatedly insisted that finding him and bringing him home is a "top" priority. 
Warren Weinstein, a contractor held by al Qaeda militants, is a U.S. citizen who has been held hostage in Pakistan since August 2011. 
U.S. tourist and Korean War veteran Merrill Newman arrives at the Beijing airport Saturday, December 7, after being released by North Korea. Newman was detained October 26 by North Korean authorities just minutes before he was to depart the country after visiting through an organized tour. His son Jeff Newman says the Palo Alto, California, man had all the proper paperwork and set up his trip through a North Korean-approved travel agency. 
Mexican authorities arrested Yanira Maldonado, a U.S. citizen, right, on May 22, for alleged drug possession. She and her husband, Gary, were traveling from Mexico back to the United States when their bus was stopped and searched. She was released on Friday, May 31, and is back in the United States. 
Saeed Abedini, a 33-year-old U.S. citizen of Iranian birth, was sentenced to eight years in prison in January 2013, accused of attempting to undermine the Iranian government and endangering national security by establishing home churches. 
North Korea has arrested Americans before, only to release them after a visit by a prominent dignitary. Journalists Laura Ling, center, and Euna Lee, to her right, spent 140 days in captivity after being charged with illegal entry to conduct a smear campaign. They were freed in 2009 after a trip by former President Bill Clinton. 
Former President Jimmy Carter negotiated the release of Aijalon Gomes, who was detained in 2010 after crossing into North Korea illegally from China. Analysts say high-level visits give Pyongyang a propaganda boost and a way to save face when it releases a prisoner. 
Eddie Yong Su Jun was released by North Korea a month after he was detained in April 2011. His alleged crime was not provided to the media. The American delegation that secured his freedom included Robert King, the U.S. special envoy for North Korean human rights issues. 
Robert Park was released by North Korea in 2010 without any apparent U.S. intervention. The Christian missionary crossed into North Korea from China, carrying a letter asking Kim Jong Il to free political prisoners and resign. North Korea's state-run news agency said Park was released after an "admission and sincere repentance of his wrongdoings." Here, Park holds a photo of Kim and a malnourished child during a protest in Seoul. 
Josh Fattal, center, Sarah Shourd, left, and Shane Bauer were detained by Iran while hiking near the Iraq-Iran border in July 2009. Iran charged them with illegal entry and espionage. Shourd was released on bail for medical reasons in September 2010; she never returned to face her charges. Bauer and Fattal were convicted in August 2011, but the next month they were released on bail and had their sentences commuted. 
Haleh Esfandiari, an Iranian-American scholar, was also detained at Evin Prison, spending months in solitary confinement before Iran released her on bail in August 2007. Esfandiari was visiting her ailing mother in Tehran when she was arrested and charged with harming Iran's national security. 
Alan Gross, at right with Rabbi Arthur Schneier, has been in Cuban custody since December 2009, when he was jailed while working as a subcontractor. Cuban authorities say Gross tried to set up illegal Internet connections on the island. Gross says he was just trying to help connect the Jewish community to the Internet. Former President Jimmy Carter and New Mexico Gov. Bill Richardson have both traveled to Cuba on Gross' behalf, but they were unable to secure his release. 
Sixteen Americans were among the dozens arrested in December 2011 when Egypt raided the offices of 10 nongovernmental organizations that it said received illegal foreign financing and were operating without a public license. Many of the employees posted bail and left the country after a travel ban was lifted a few months later. Robert Becker, right, chose to stay and stand trial. 
Freelance reporter James Foley went missing in November 2012 after his car was stopped by gunmen in Syria. He is likely being held by the Syrian government, according to the GlobalPost, an online international news outlet to which he contributed, and Foley's brother. 
Filmmaker Timothy Tracy was arrested in Venezuela in April on allegations of funding opponents of newly elected President Nicolas Maduro, successor to the late Hugo Chavez. Tracy went to Venezuela to make a documentary about the political division gripping the country. He was released in June. Americans detained abroad
Americans detained abroad
Americans detained abroad
Americans detained abroad
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Photos: Americans detained abroad Mathematically, it's not an even swap. But President Barack Obama's administration maintains it's not a risky move for the United States.
The five detainees have been at Guantanamo Bay in Cuba for years, and out of commission for a long time. They probably don't have extensive networks to tap into, according to two senior U.S. officials.
Additionally, there will be fewer U.S. forces to target in Afghanistan since under a new agreement, most troops will be out of the nation next year.
Qatar has also reassured the United States that it will aggressively monitor the detainees, who will be under a travel ban for one year.
How many freed detainees have returned to terrorism?
At its peak, Guantanamo Bay had 770 men believed by the U.S. government to be involved in terrorist activity or military attacks.
That number has dwindled significantly. As of last month, the facility had 154 detainees.
A September 2013 report from the director of national intelligence reflected on what happened to the roughly 600 people who left Gitmo between its opening in 2002 and July 2013.
Of those, 100 -- or 16.6% of the released prisoners -- were "confirmed" to have returned "to terrorist activities." Seventeen of those died, while 27 ended up in custody, according to the DNI report.
An additional 70 are "suspected of reengaging," it said.
"Based on trends identified during the past 10 years, we assess that if additional detainees are transferred without conditions ... some will reengage in terrorist or insurgent activities," the report said.
Does the U.S. keep an eye on freed detainees?
While the former prisoners are no longer under its control, Washington says it keeps track of them, which is the basis of the DNI report.
During President George W. Bush's administration, some were handed over to authorities in other countries.
Dozens more were released under Obama.
Are American interests more at risk when they get out?
There are a lot of variables, making this a debatable question.
Except for those accused or convicted of the most heinous crimes such as murder, most people are not detained indefinitely.
And studies show the recidivism rate for those in the U.S. legal system typically top 50% or even 60%, according to the Bureau of Justice Statistics. Armed with that knowledge, the idea of a Gitmo detainee returning to his previous ways may not be surprising.
It also depends on where they go from there.
The DNI report notes the dangers of transferring prisoners to nations with conflicts, instability and active recruitment by terror groups.
In other words, a detainee who returns to a place beset by violence -- where terrorist groups and attacks are common -- is more likely to return to the fold.
Does this mean the U.S. got a raw deal in Bergdahl's release?
Depends on whom you ask.
Sen. John McCain, a former prisoner of war, is not popping the Champagne just yet.
He knows a thing or two about life in enemy hands after spending more than five years in captivity in North Vietnam. Since then, he has emerged as one of the nation's loudest, boldest voices on military matters.
And he feels strongly that the United States did not think this through.
"Don't trade one person for five (of) the hardest of the hard-core, murdering war criminals who will clearly re-enter the fight and send them to Qatar, of all places," he told CNN's Anderson Cooper on Tuesday night.
But White House National Security Adviser Susan Rice defended the Obama administration's decision.
The "acute urgency" of Bergdahl's health condition justified the President not notifying Congress beforehand that he was being swapped for the five detainees, she said.
Why are terror suspects held at Guantanamo Bay?
The U.S. naval base there was transformed after the September 11, 2001, terrorist attacks. Existing migrant detention facilities were revamped to house detainees of the so-called war on terror.
These were men, who though captured in the battlefield, didn't fit any detention category. U.S. authorities said they didn't have the same rights as prisoners of war under the Geneva Conventions. Nor did they have the same rights as those detained within the United States.
The Bush administration argued that since the detainees were not on U.S. soil, they were not covered by the U.S. Constitution. It used that rationale to justify the lack of legal protections for those detained.
That made the base sometimes referred to as Gitmo a sort of no man's land.
How much does it cost to keep it running?
It costs the Defense Department about $150 million a year to keep the facility in operation.
The U.S. pays Cuba about $4,085 a year for the lease, but the latter hasn't accepted payment since 1959.
Shortly after his inauguration in 2009, Obama signed an executive order to close the detention facility within one year. It has not happened.
Has everyone at Gitmo been found guilty of terrorism?
No.
Peter Bergen, a CNN national security analyst, and Bailey Cahall, a research associate at the New America Foundation, wrote in an op-ed last year that said dozens of detainees cleared for release years ago "remain in seemingly perpetual custody."
"They have found to be guilty of nothing, yet they are being held indefinitely," Bergen and Cahall wrote.
"Indefinite detention without charge is a policy that we usually associate with dictatorships, not democracies."
Bergen also heads the New America Foundation's International Security Program.
Others, though, view the situation differently. They say terrorists don't play by any recognized rules of warfare or justice; their mission is to kill, with U.S. forces and citizens as their targets.
McCain says that the five men released as part of the Bergdahl deal could be among those attacking U.S. citizens both at home and overseas.
The five "were judged time after time as unworthy ... that needed to be kept in detention because they posed a risk and a threat to the United States of America," the Arizona Republican said.
Who were the detainees swapped for Bergdahl?
Two senior Obama administration officials identified them as Khair Ulla Said Wali Khairkhwa, Mullah Mohammad Fazl, Mullah Norullah Noori, Abdul Haq Wasiq and Mohammad Nabi Omari.
They were mostly mid- to high-level officials in the Taliban regime who were detained early in the war in Afghanistan because of their positions within the Taliban, not because of ties to al Qaeda.
But some such as Khairkhwa are alleged to have been "directly associated" with Osama bin Laden and al Qaeda's now-deceased leader in Iraq, Abu Musab al-Zarqawi.
