the site of numerous interactions between North and South, including over 750 overt acts of violence. The UNC has documented most of the violent incidents with reports and photographs, which have been reported in the course of MAC meetings. Countless fistfights, shouting matches, exchanges of rude gestures, and other provocations have occurred since 1953. There have also been several prisoner exchanges and other interactions. 1950s Operation Little Switch, April 1953 This operation was a test case for prisoner repatriation, one of the four main issues of contention during two years of negotiation. 605 sick, wounded, and/or injured UNC prisoners were exchanged for 6,030 sick or injured Communist prisoners. Operation Big Switch, April–September 1953 Based on the success of the repatriations undertaken earlier, a general exchange of prisoners began in late April. During Operation Big Switch, prisoners were brought to Panmunjom, on the banks of the Sachong River. Each prisoner was then asked if he wished to cross the river and return to his countrymen or remain with his captors. Once the choice was made there was no turning back—hence the name Bridge of No Return. During this time 13,444 UNC prisoners returned to UNC countries, and 89,493 KPA and CPV prisoners returned to their Communist countries. In June 1953, ROK president Syngman Rhee released a further 25,000 KPA soldiers held in ROKA camps (mostly southerners impressed into service for the north) into South Korea in an attempt to wreck the armistice negotiations. Operation Movement of Custodial Forces—India, September 2, 1953 The Armistice Agreement provided that a nonbelligerent nation would provide security forces to hold any prisoner of war who refused repatriation. India provided 6,413 soldiers for this purpose. After landing at the port of Inchon, the UNCMAC Support Group (Provisional) moved all personnel to the Demilitarized Zone by helicopter in a single day without incident. Operation Comeback, January 21, 1954 Approximately 23,000 KPA and CPV soldiers held in UNC prisoner of war camps refused to return to Communist control. Twenty-two UNC soldiers (21 Americans, one Briton) also refused repatriation. Under the provisions of the Armistice, these soldiers were held for a further six months and interviewed by neutral observers to ensure they had not been coerced into refusing repatriation. Most KPA expatriates remained in South Korea, while the overwhelming majority of CPV expatriates traveled to Taiwan to join the Nationalists. Operation Rainbow, March 1954 During this operation the UNCMACSG(P) oversaw