Immediately after KPA resistance was extinguished in Inchon, the supply and reinforcement process began. Seabees and Underwater Demolition Teams (UDTs) that had arrived with the US Marines constructed a pontoon dock on Green Beach and cleared debris from the water. The dock was then used to unload the remainder of the LSTs. Early that morning of September 16, Lieutenant Colonel Murray and Colonel Puller had their operational orders from 1st Marine Division commander General Oliver P. Smith. The 1st Marines and 5th Marines began moving along the Inchon-Seoul road.