[417] The tanks were not kept in exposed firing positions at all times. They were parked in protected, defilade revetments and were periodically driven into the firing slots to zero in on targets of opportunity. One tank might thus use any of several slots, and in cases of major attacks reserve tanks could reinforce. LtCol Robert J. Post ltr to Dir, MCHist, HQMC, dtd 28 May 70, hereafter _Post ltr_. Also remaining in their same positions were MASRT-1 (Marine Air Support Radar Team One), in support of the 25th Infantry Division, MTACS-2 (Marine Tactical Air Control Squadron Two), and VMO-6. The mobile air support section of the observation squadron, however, had moved with the 1st Marine Division to the new Casey area for participation in the coming MARLEX operations scheduled during the reserve training period. Thus with the relief completed, components of the old Marine division front, from left to right, were: the Kimpo Provisional Regiment; Task Force Track; the 27th Infantry Regiment; 35th Infantry Regiment in the center sector, including its armor and heavy mortar company and 2d and 3d Battalions forward, replacing the 1st Marines 3d and 1st Battalions; and in the right sector, the Turkish Brigade 4.2-inch mortar company and its 1st and 3d Battalions initially located[418] in the MLR positions vacated by the 2d and 3d Battalions, 7th Marines. [418] Later, the Turkish forces were to place three battalions forward [adding the 2d], with a fourth in reserve. In addition to the 1st Marine Division railhead and truckhead at Munsan-ni and Ascom City, a subsidiary railhead/truckhead was opened at Tongduchon-ni, two miles southwest of the new division CP at Casey. No change was made in the airhead at K-16. Effective with the 5 May change, remaining elements of the division CP staff at Yongji-ri joined the advance elements at Casey. As the Marines moved off the front lines they received “well-done” messages from the Commandant, General Shepherd, and the U.S. Pacific Fleet Commander in Chief, Admiral Arthur W. Radford, as well as the new I Corps Commander, Lieutenant General Bruce C. Clarke[419] who cited the “excellence of the planning, coordination and cooperation which enabled the operation of the past few days to be successfully accomplished.”[420] [419] General Clarke had succeeded General Kendall on 10 April 1953. [420] CG, I Corps msg to CGs, 1stMarDiv, 25th InfDiv, dtd 6 May 53, in 1stMarDiv ComdD, May 53, App. I, p. 2. _Training While in Reserve and Division Change of Command_[421]