Organizational changes within the wing included the arrival, on 29 May, of a new MAG-12 unit to replace the “Checkerboard” squadron. VMA-332 (Lieutenant Colonel John B. Berteling) was slated to operate on board the USS _Bairoko_ (CVE-115) for the F4U carrier-based squadron VMA-312[447] due for return to CONUS. Veteran of 33 months of combat while attached to the wing as West Coast (CTE 95.1.1) aerial reconnaissance and blockade squadron, VMA-312 (Lieutenant Colonel Winston E. Jewson) was officially relieved 10 June. The change, moreover, was the first phase of a new personnel policy, carrier unit rotation, that was expected to implement a unit rotation program for land-based squadrons. It was anticipated that the new unit rotation program would eliminate inherent weakness of the individual pilot rotation system and thus increase the combat effectiveness of the wing.[448] [447] Prior to early May, VMA-312 had been based aboard the USS _Bataan_ (CVL-29). The carrier itself was scheduled for relief from the Korean Theater shortly before the new afloat MAG-12 squadron reported in, and a transfer was made by 312 to the new, larger escort carrier on 8 May. [448] Comments _PacFlt EvalRpt_ No. 6, Chap. 10, p. 10-33: “Severe tactical operations weakness developed throughout the war in Korea which can be traced directly to the individual pilot rotation system. These weaknesses are inherent in any system which precludes pre-combat unit training of pilots in the tactical squadron with which they later go into combat. The situation is aggravated further when pilots, many of them inadequately pre-combat trained, are rotated through combat engaged units so rapidly that squadron esprit cannot develop to a degree which will insure a high standard of tactical efficiency.” During the period other organizational changes included transfer of administrative control of VMF(N)-513 on 15 May from MAG-33 to MAG-12.[449] The squadron, with its new twin-engined jet fighters, moved from K-8 (Kunsan) further up the coast to the MAG-12 complex at K-6 (Pyongtaek), upon completion of the new 8,000-foot concrete runway there. This phased redeployment of nightfighter personnel and equipment began in late May and was concluded on 6 June without any interim reduction of combat commitments. Replacement of the squadron F7F-3Ns with F3D-2s was also completed in early June. [449] MAG-12, since 1 April, had been under Colonel Edward B. Carney, who assumed command upon reassignment of Colonel Bowman to the States. Late that month, plans were underway for two additional changes: the Marine photographic squadron, VMJ-1, was due to be separated administratively and operationally from MAG-33 on 1 July and revert to 1st MAW; and Marine Wing Service Squadron One (MWSS-1) was to be deactivated, effective 1 July.