vList of border incidents involving North Korea
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The following is a partial list of border incidents involving North Korea since the Korean Armistice Agreement of July 27, 1953, ended large scale military action of the Korean War. Most of these incidents took place near either the Korean Demilitarized Zone or the Northern Limit Line. This list includes engagements on land, air, and sea, but does not include alleged incursions and terrorist incidents that occurred away from the border.
Many of the incidents occurring at sea are due to border disputes. In 1977 North Korea claimed an Exclusive Economic Zone over a large area south of the disputed western maritime border, the Northern Limit Line in the Yellow Sea. This is a prime fishing area, particularly for crabs, and clashes commonly occur. According to the 5 January 2011 Korea Herald, since July 1953 North Korea has violated the armistice 221 times, including 26 military attacks
16 February 1958: North Korean agents hijack a South Korean airliner to Pyongyang en route from Pusan to Seoul; 1 American pilot, 1 American passenger, 2 West German passengers, and 24 other passengers were released in early March, but 8 other passengers remained in the North.
1964: North Korea creates an underground group: Revolution Party for Reunification, this group is ground down and eliminated by South Korean authorities by 1969 
April 27, 1965: Two North Korean MiG-17s attack a United States EC-121 Warning Star reconnaissance plane above the Sea of Japan, 80 km (50 mi) from the North Korean shore. The aircraft was damaged, but managed to land at Yokota Air Base, Japan.
January 17, 1968: In an incident known as the Blue House Raid, a 31-man detachment from the Korean People's Army secretly crosses the DMZ on a mission to kill South Korean President Park Chung-hee on January 21, nearly succeeding. The incursion was discovered after South Korean civilians confronted the North Koreans and informed the authorities. After entering Seoul disguised as South Korean soldiers, the North Koreans attempt to enter the Blue House (the official residence of the President of South Korea). The North Koreans are confronted by South Korean police and a firefight ensued. The North Koreans fled Seoul and individually attempted to cross the DMZ back to North Korea. Of the original group of 31 North Koreans, 28 were killed, one was captured, and two are unaccounted for. Additionally, 68 South Koreans were killed and 66 were wounded, the majority of whom were soldiers and police officers. Three American soldiers were also killed and three were wounded.
January 23, 1968: The United States Naval ship the USS Pueblo is boarded and captured, along with its crew, by North Korean forces in the Sea of Japan. The entire crew of 83 is captured, with the exception of one sailor killed in the initial attack on the vessel, and the vessel was taken to a North Korean port. All the captives were released on December 23 of the same year via the Bridge of No Return at the DMZ. The USS Pueblo is still in North Korean possession and is docked in Pyongyang and is on display as a museum ship.
From March 1968 and March 1969, various military skirmishes took place in the Paektusan region between the North Korean and Chinese armed forces.
October 30, 1968: From October 30 to November 2, 120 to 130 North Korean commandos land on the northeast shore of South Korea, allegedly to establish a base in order to wage a guerrilla war against the South Korean government. A total of 110 to 113 were killed, seven were captured, and 13 escaped. Around 20 South Korean civilians, law enforcement officers, and soldiers were killed.
Er, Rogue, all that verbiage to announce that 4 American servicemen ( 5 too many, I agree). Four,. That's it, in 61 years?