Breaking reports of a plainclothes American soldier detained after willfully crossing the Military Demarcation Line into North Korea has recalled past incidents which involved Americans finding themselves on the wrong side of that border. 

The soldier was identified by a senior U.S. defense official as Private 2nd Class Travis King, who was serving under U.S. Forces Korea and the U.S. Army and was due to face disciplinary action. King was supposed to board a flight to go back to the U.S. and was escorted to the airport, but the military escort could not follow him past airport security, so King entered the terminal by himself with no escort. 

A U.S. defense official told Fox News the soldier was on a tour in a personal capacity and was wearing civilian clothes at the time of the incident. A U.S. Forces Korea spokesperson said that officials believed King was in Democratic People’s Republic of Korea (DPRK) custody and they were working to "resolve this incident." 

King can look to other Americans who similarly ended up in the DPRK, either on purpose or by accident, and the range of fates that befell them as a result. 

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Demarcation Line Pyongyang

UNC (United Nations Command) soldiers (R) and a South Korean soldier (L) stand guard before North Korea's Panmon Hall (rear C) and the military demarcation line separating North and South Korea, at the Joint Security Area (JSA) of the Demilitarized Zone (DMZ) in the truce village of Panmunjom on October 4, 2022. (Anthony Wallace/AFP via Getty Images)

The earliest known American to cross the MDL was Charles Jenkins, who fled to the Hermit Kingdom after deserting his post in 1965. North Korea welcomed him and utilized him as a propaganda asset, using him in leaflets and films. 

Jenkins remained in North Korea until 2004, during which time he married Hitomi Soga, a Japanese nursing student who had been abducted by North Korean agents. The couple departed North Korea for Japan, where Jenkins surrendered to military authorities to face charges for desertion, for which he served 25 days in a U.S. military jail in Japan. 

Most famous among the handful of Americans to enter North Korea would be 22-year-old University of Virginia student Otto Warmbier, who died in June 2017 shortly after he returned home in a vegetative state following a 17-month stay in North Korean custody. 

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Warmbier Imprisoned Korea

Otto Frederick Warmbier, a 21-year-old undergraduate student of commerce from Virginia University of the U.S., speaks during a news conference in Pyongyang, capital of the Democratic People's Republic of Korea, Feb. 29, 2016.  (Xinhua/Lu Rui via Getty Images)

Warmbier suffered brain damage while in custody for an alleged "hostile act against the state." North Korea never provided a clear reason for the injury and denied accusations that he was tortured, insisting officials had provided medical care with "all sincerity." 

His parents sued North Korea over the death, with a judge deciding the hermit kingdom liable for $501 million in damages as an "appropriate" measure intended to "deter North Korea" for "torture, hostage-taking and extrajudicial killing," but North Korea ignored the order. 

Kim Jong Un

In this photo provided by the North Korean government, North Korean leader Kim Jong Un inspects military exercises at an undisclosed location in North Korea on Oct. 8, 2022. Independent journalists were not given access to cover the event depicted in this image distributed by the North Korean government. The content of this image is as provided and cannot be independently verified.  (Korean Central News Agency/Korea News Service via AP)

North Korea often insists Americans crossing the line intended to act as espionage agents for the United States or other Western allies, such as in the case of Matthew Miller, a 24-year-old from Bakersfield, California, who was sentenced to six years of hard labor on charges that he illegally entered the country for spying purposes. 

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North Korean soldiers keep watch toward the south next to a spot where a North Korean has defected crossing the border on November 13, at the truce village of Panmunjom inside the demilitarized zone, South Korea, November 27, 2017. REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY - RC1879318990

North Korean soldiers looking toward the South at the DMZ.  (Reuters)

Miller told the Associated Press at the time that he dug out the fields eight hours a day and spent his time otherwise in isolation. The North Korean Supreme Court claimed Miller had a "wild ambition" to experience the country’s prison life so he could secretly investigate the country’s human rights conditions. 

Miller returned home just six months after his initial detention, returning home with Kenneth Bae, a missionary and tour leader jailed for allegedly smuggling "inflammatory literature" into the country and attempting to establish a base for anti-government activities. 

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James Clapper, then-U.S. director of national intelligence in 2014, had worked through a secret mission to secure the Americans’ release. 

 Fox News’ Jennifer Griffin and Liz Friden, Fox News Digital’s Greg Norman and the Associated Press contributed to this report.