Opposing them in mid-July were an estimated 27 infantry battalions, whose primary missions were to defend the sectors assigned. The division credited these units with the capability of launching limited objective attacks at any time or of taking part in a major attack with a force of up to 57 infantry and 16 artillery battalions, augmented by 40 tanks or self-propelled guns. It was estimated also that the enemy could cross the Han in battalion strength in the vicinity of the northern shore of Kimpo Peninsula at any time and that Communist aircraft could attack anywhere in the division sector. Enemy forces identified at the end of July, from west to east, were the 193d, 195th, and 194th Divisions of the 65th CCF Army; the 189th Division of the 63d CCF Army; and the 118th Division, 40th CCF Army, which had recently moved from a position opposite the Commonwealth and U.S. 3d Infantry Divisions. Infantry strength of the Communists was established at 28,328. _Replacement and Rotation_[146] [146] Unless otherwise noted, the material in this section is derived from _PacFlt EvalRpts_ No. 4, Chaps. 9, 10; No. 5, Chaps. 8, 9. Marine infantry strength at the end of July 1952 was little more than half of the Chinese total. The division personnel strength was maintained by the monthly replacement and rotation program of Marines to fill vacancies created by the return of Marine combat personnel to CONUS (Continental United States) and combat losses. In the second quarter of 1952, the division rotated 433 officers and 6,280 enlisted men from Korea. In exchange, 506 officers and 7,359 enlisted men arrived from the States in replacement drafts. A new arrival could expect to stay with the division about 10½ months. In the late spring of 1952 many of the division’s new replacements were “dental cripples”--Marines requiring dental treatment, even emergency care in some cases.[147] General Selden directed that contact teams be formed to meet the replacement drafts in Japan. During the last leg of the trip to Korea dental personnel screened the new combat Marines on shipboard. By the time the division area had been reached, the dentists knew what remedial work would be required by incoming troops. At the end of the summer the problem was well under control. [147] _Brunelli ltr._