[415] Final relief was largely complete at this time. Exceptions were the 7th Marines reserve battalion, 1/7, relieved by TAFC forces at 0350 the following day and a few remaining Marine rear echelon elements that closed out the sector on 7 May. [Illustration: MAP 28 K. White 25th INFANTRY DIVISION SECTOR FOLLOWING RELIEF OF THE 1st MARINE DIVISION 5 MAY 1953] I Corps Operation Orders No. 31 and 32 had directed that the 11th Marines remain on line in the sector attached to I Corps Artillery, with a general support mission of reinforcing the fires of the 25th Division artillery, and a secondary task of coordinating counterbattery support. The medium battalion, 4/11, and the 1st 4.5-inch Rocket Battery, furnished general support for I Corps. Regimental and battalion CPs, as well as the rocket battery, continued to occupy their same locations. A change affected the KMC artillery battalion, however; when transferred to I Corps artillery control it displaced from the Marine sector, with a new general support role of reinforcing the I Corps line. Also on 5 May, at 1130, the 1st Tank Battalion[416] passed to 25th Division control. Two companies, C and B, were assigned to the TAFC (which had no armored units) in the left and right battalion areas, respectively. Company D vehicles came under command of the 35th Infantry Regiment, in the center sector; while A, the remaining company, was designated as the single reserve unit. This was a modification of the Marine system of maintaining two tank companies in reserve, one a short distance behind the MLR and the other, at the armored battalion CP near Munsan-ni. A change in tactics also took place when the Marine tanks came under Army operational control. It had been the Marine practice to retain the tanks at the company CP from where they moved to prepared firing slots at the request of the supported infantry unit. [416] The 1st Tank Battalion was now commanded by Lieutenant Colonel Charles W. McCoy, who had relieved Lieutenant Colonel Williamson on 16 April 1953. When the 1st Tank Battalion was attached to the 25th Division, the armored vehicles were shifted to firing slots near the MLR where they occupied semifixed positions.[417] Armored personnel carriers (APCs) were assigned by the Army to Company B and used by both B and C as resupply vehicles to haul food, water, fuel, and ammunition to the tanks on line. Also as part of the relief, control of the KMC tank company was transferred from the Marine 1st Tank Battalion to I Corps, although the company still continued in its same location in the old KMC sector.