As the new week began on Monday, 6 April, and the world looked to Panmunjom for the next set of signals in the war, a new stage developed in the truce negotiations. Within five days after the talks had begun, both sides agreed to return the disabled prisoners in their custody. Final papers for the preliminary exchange were signed at noon on 11 April by Rear Admiral John C. Daniel, USN, for the United Nations Command, and Major General Lee Sang Cho, of the Communist delegation. The week-long transfer of sick and wounded POWs was scheduled to begin 20 April, at Panmunjom. The Communists announced they intended to release 600 sick and wounded UNC prisoners (450 Korean, 150 non-Korean), a figure which Admiral Daniel called “incredibly small.”[395] For its part, the UNC indicated that it planned to free nearly ten times that number of North Korean and Chinese POWs. Communist and Allied representatives also agreed that truce talks would be resumed at Panmunjom, once the prisoner exchange was completed. [395] Hermes, _Truce Tent_, p. 415. Security precautions went into effect at both Panmunjom[396] and the entire Munsan-ni area, 10 miles southeast, on the first day of the prisoner talks. All facilities at both Panmunjom and Munsan-ni were placed off limits to Eighth Army personnel not directly involved in the operations. Regulations were strictly enforced. Even before the negotiations opened at Panmunjom, actual construction work for LITTLE SWITCH was well under way by Marine engineers. “Operation RAINBOW,” as the building of the facilities for the POW exchange was called, began 5 April. [396] With resumption of truce negotiations, the 1st Marines, whose left battalion sector was immediately adjacent to the Panmunjom neutral zone between the two battle lines, took certain precautionary measures. The regiment set up radio communication with the UN base camp at Munsan and reactivated its rescue task force. This unit was on alert to evacuate the UN truce team from Panmunjom in the event of Communist hostile action or any threat to security. While the talks were in session, a forward covering group, composed of a reinforced rifle company and 1st Tank Battalion platoon, occupied the high ground east of Panmunjom at COP 2. Here the Marine rescue force maintained close surveillance of the enemy in the Panmunjom peace corridor as well as the safe arrival and departure of the UN truce team shuttled in by helicopter or motor convoy. 1stMar ComdD, Apr 53, pp. 5, 14 and App. II, pp. 1–4.