In mid- and late March, the units forward in the 1st Marine Division sector of the main defense line, JAMESTOWN, remained much as they had been in recent months. Left to right, the defending components were the Kimpo Provisional Regiment, 1st Amphibian Tractor Battalion, 1st Korean Marine Corps Regimental Combat Team (1st KMC/RCT),[354] 1st Marines, and 5th Marines. One change had occurred when the 1st Marines relieved the 7th in the center sector earlier in the month. The latter was now in division reserve in the Camp Rose rear area. Before long, this regiment was to see more offensive action in a hotly contested, five-day period than it had during its entire recent tour on line. Overall, the 1st Marine Division continued as one of the four infantry divisions in the I Corps sector of EUSAK[355] and, in fact, the month itself marked exactly one year since the Marines had arrived on the western front. [354] The 1st KMC Regiment had been redesignated the 1st KMC/RCT on 15 Dec 52. Continuing under opcon of the 1stMarDiv, the Korean RCT consisted of four infantry battalions, plus attached artillery, armor, engineer, and service units. _PacFlt EvalRpt_ No. 5, Chap. 8, p. 8-64. [355] To the Marine division right were the U.S. 2d Infantry, ROK 1st, and U.S. 7th Infantry Divisions. Occupying the far eastern end of the division sector, the 5th Marines, under command of Colonel Walt,[356] had been assigned to the MLR since late January. The regiment manned six miles of the JAMESTOWN front. It was flanked on the left by the 1st Marines while to the right its neighbor was the 38th Regiment, 2d Infantry Division, U.S. Army. [356] No stranger to the 5th Marines, Colonel Walt had served with this regiment during World War II at Guadalcanal, Cape Gloucester, and Peleliu. He had commanded, on separate occasions, 2/5 and 3/5 and had earned two Navy Crosses for combat leadership and bravery. Since 20 February, the western part of the 5th regimental sector had been held by Lieutenant Colonel Platt’s 1/5, with Companies A, B, and C on line, from left to right. The battalion area held four outposts. COP Ava was tucked down near the boundary between the 1st and 5th Regiments, while the Nevada, or Three Cities, triangle screened the central part of the latter regimental sector. A Company A squad[357] outposted Ava, some 325 yards forward of the main line. Personnel of Company C were stationed on Carson and Reno. Vegas had a unique command situation. Due to its proximity to the boundary between 1/5 and 3/5, Vegas came under operational control of the former battalion while personnel charged with its defense belonged to Company H of 3/5. [357] Normally Ava was a squad-size outpost. Prior to and during the late March attacks, all 5th Marine COPs were strengthened.