Even though the 1st Marine Division in July continued to be somewhat in excess of its authorized strength in total personnel, it had certain imbalances and was in rather short supply of certain ranks and specialists. While the normal tour for most infantry officers ranged from 9 to 12 months, an excess of company grade officers, particularly lieutenants, had resulted in a reduction of the Korean tour for them to just six months. This brief period of duty plus an intra-division rotation policy that caused a mass shifting of duty assignments every three-to-five months tended to reduce unit combat efficiency. On the other hand the change of assignments had a favorable effect in that it broadened the experience of individual Marines. Beginning in the summer of 1952, however, the division modified this policy to reduce its number of intra-division transfers. Personnel shortages existed in both the artillery and tank MOSs (Military Occupational Speciality). Mass rotation of reservist company grade artillery officers had necessitated the transfer of infantry officers to the 11th Marines for training and reassignment within the regiment. During the time when the supply of artillery officers was limited, however, the quality of support rendered remained high.[148] The other major shortage in the division was that of qualified crewmen--both drivers and gunners--for the M-46 tanks. Neither tank driving nor gunnery for the M-46 was taught in the tank crewmen’s course conducted at Camp Pendleton, California. General Selden requested of Lieutenant General Franklin A. Hart (CG, FMFPac) that “tank crewmen be thoroughly trained prior to leaving the U.S.”[149] [148] _PacFlt EvalRpt_ No. 4, p. 9-27. [149] 1stMarDiv ComdD, July 52, p. 4. Fundamental to the tank problem was a shortage of the M-46 itself. At the training facility, Training and Replacement Command, Camp Pendleton, M-46 engines had been available for maintenance instruction but no tanks for the training of gunners and drivers.[150] General Hart pointed out this deficiency to the Commandant, General Lemuel C. Shepherd, Jr. On 13 August the Commandant directed the transfer of five tanks to the training installation from the 7th Tank Battalion,[151] also located at Camp Pendleton. At the same time General Shepherd ordered an increase in the school quota for tank crewmen. The first graduates would not reach the division in Korea, however, until the November draft. [150] FMFPac ComdD, Jul 52, App VIII, Encl (7), Anx (E). [151] FMFPac ComdD, Aug 52, App I, Encl (35).