“To defend” were the key words in the 1st Marine Division mission--“to organize, occupy, and actively defend its sector of Line JAMESTOWN”--in West Korea. General Selden’s force to prevent enemy penetration of JAMESTOWN numbered 1,364 Marine officers, 24,846 enlisted Marines, 1,100 naval personnel, and 4,400 Koreans of the attached 1st KMC Regiment. The division also had operational control of several I Corps reinforcing artillery units in its sector. On 31 March, another major infantry unit, the Kimpo Provisional Regiment (KPR) was organized. The division then assumed responsibility for the Kimpo Peninsula defense on the west flank with this Marine-Korean force. A major reason for transfer of the 1st Marine Division to the west, it will be remembered, had been the weakness of the Kimpo defense. Several units, the 5th KMC Battalion, the Marine 1st Armored Amphibian Battalion, and the 13th ROK Security Battalion (less one company), had been charged with the protection of the peninsula. Their operations, although coordinated by I Corps, were conducted independently. The fixed nature of the Kimpo defenses provided for neither a reserve maneuver element to help repel any enemy action that might develop nor a single commander to coordinate the operations of the defending units. These weaknesses become more critical in consideration of the type of facilities at Kimpo and their proximity to the South Korean Capital. Seoul lay just east of the base of Kimpo Peninsula, separated from it only by the Han River. Located on Kimpo was the key port of Inchon and two other vital installations, the logistical complex at Ascom City and the Kimpo Airfield (K-14). All of these facilities were indispensable to the United Nations Command. To improve the security of Kimpo and provide a cohesive, integrated defense line, CG, 1st Marine Division formed the independent commands into the Kimpo Provisional Regiment. Colonel Edward M. Staab, Jr., was named the first KPR commander. His small headquarters functioned in a tactical capacity only without major administrative duties. The detachments that comprised the KPR upon its formation were: Headquarters and Service Company, with regimental and company headquarters and a communication platoon; 1st Armored Amphibian Battalion, as supporting artillery; 5th KMC Battalion; 13th ROK Security Battalion (-); One battalion from the reserve regiment of the 1st Marine Division (2/7), as the maneuver element; Company A, 1st Amphibian Tractor Battalion; Company B, 1st Shore Party Battalion, as engineers; Company D, 1st Medical Battalion; Reconnaissance Company (-), 1st Marine Division; Detachment, Air and Naval Gunfire Liaison Company (ANGLICO), 1st Signal Battalion; Detachment, 181st Counterintelligence Corps Unit, USA; Detachment, 61st Engineer Searchlight Company, USA; and the 163rd Military Intelligence Service Detachment, USA.