the repatriation of displaced persons, expellees, and refugees from North Korea to South Korea across the Military Demarcation Line at Panmunjom. 1960s On August 29, 1967, at 1645 hours, KPA soldiers armed with small arms and light machine guns attacked the United States Army Support Group Advance Camp (now known as Camp Bonifas). During this attack one US soldier and two ROKA soldiers were killed. An additional twelve US soldiers, nine ROKA soldiers, and three ROK civilians were wounded. The KPA soldiers were pursued to the MDL by US soldiers from the Advance Camp. Following this incident the southern boundary fence for the DMZ was relocated to a line north of the camp's perimeter. On April 14, 1968, at 2300 hours, KPA soldiers ambushed a UNC truck transporting UNC relief guards to the JSA and Neutral Nations (Swiss/Swede) camp. Using small arms, automatic weapon fire and hand grenades, the KPA soldiers succeeded in stopping the truck and attempted to kill all six soldiers aboard. They withdrew across the MDL after killing four of the soldiers (two US and two ROKA) and wounding the remaining two soldiers. Operation Breeches Buoy On December 23, 1968, Commander Lloyd M. Bucher and his 81 crewmen from USS Pueblo crossed the Bridge of No Return to freedom. They had spent the previous eleven months in captivity after their electronic surveillance ship was attacked and seized by DPRK naval forces on January 22, 1968. Secret negotiations had taken place in the JSA Conference Room during the time of their captivity. They were the last group of UNC personnel to cross the Bridge of No Return. Operation Temple Bell, December 1969 On August 17, 1969, an unarmed OH-23 observation helicopter strayed over DPRK airspace and was forced to land in North Korea. The three crew were held for months during negotiations between Major General A. H. Adam senior negotiator at the UN Command, and North Korean Major General Lee Choon-sun. In early December 1969 the three crew members were released and ushered over the Bridge of No Return. 1970s Operation Runaway I, February 14, 1970 A Korean Air Lines aircraft was hijacked by a North Korean agent on December 11, 1969, and forced to divert to Sondǒk Airfield in Wonsan, North Korea. Aside from the hijacker, the plane carried 46 passengers and four crew members. 39 passengers were repatriated through Panmunjom on Valentine's Day, 1970. The remaining