(2) To relieve all elements of I ROK Corps in Kojo and zone.
(3) To protect the Wonsan-Kojo-Majon-ni area, employing not less than one RCT, and patrolling all roads to the west in zone.
(4) To advance rapidly in zone to the Korean northern border.
(5) To be prepared to land one Battalion Landing Team (BLT) in the Chongjin area rapidly on order.
(6) To assist the 101st Engineer Group (C) (ROK) in the repair of the Yonghung-Hamhung railroad, employing not less than one engineer company.[121]
[121] Smith, Notes, 393–394; G-3 SAR, 5–6.
The 1st Marine Division in turn assigned these tasks to the following units in OpnO 18-50, issued at 0800 on the 28th but communicated orally to most of the designated commanding officers during the preceding 48 hours:
(1) RCT-1 to relieve elements of I ROK Corps in Wonsan-Kojo-Majon-ni zone, establish necessary road blocks to prevent movement into the area, patrol roads, and destroy enemy in zone. RCT-1 to maintain one reinforced battalion at Kojo until further orders.
(2) RCT-7 to relieve elements of I ROK Corps along the Hamhung-Chosin Reservoir road, advance rapidly to the northern tip of the reservoir and Changjin, prepared for further advance to the northern border of Korea, and to destroy enemy in zone.
(3) RCT-5 to move to an assigned zone behind RCT-7, relieve elements of I ROK Corps in the vicinity of Fusen Reservoir, establish necessary road blocks to prevent movement into the area, patrol the roads and destroy the enemy.