Travis King isn't the 1st U.S. soldier to enter North Korea. Here's a history

Charles Jenkins (left), age 64, his wife Hitomi Soga (second from left) and their daughters arrive at Japan's Sado Island in December 2004, almost 40 years after he defected to North Korea. (Jiji Press/AFP via Getty Images)

A U.S. soldier is reportedly being held in North Korea after bolting across the border, becoming the first American service member to do so in over four decades.

It is still unclear whether Pvt. 2nd Class Travis King intended to defect, though experts say a trip to the Demilitarized Zone takes days of planning. U.S. officials say he crossed "willfully and without authorization."