MAG-33 was designated by General Harris from the Forward Echelon, 1st MAW, to serve as TAC X Corps, with VMFs 212 and 312 in addition to VMF(N)-542 and the rear echelon of VMF(N)-513. These units were not to be assigned, however, until X Corps assumed control of operations in the objective area, whereupon they would be based at Kimpo Airfield. Meanwhile, they remained under the administrative control of ComNavFE and MAG-12, with headquarters at the Itami AFB in Japan. The two Marine carrier-based squadrons and the forward echelon of VMF(N)-513, having come out to Korea in August as units of MAG-33, continued to be assigned temporarily to that group for administrative purposes.[102] [102] 1st MAW _SAR_, basic rpt and Annex Able: PacFlt _Interim Rpt No. 1_, XV: Charlie Charlie, 4–5. TAC X Corps was activated on 8 September, just six days before its components landed in Japan. 1st MAW planners designated the Air Support Section of MTACS-2, which had controlled air support for the Brigade, to continue in that capacity for the Landing Force and later for the entire X Corps. Arrangements were made with the Combat Cargo Command, FEAF, to airlift aviation fuel and ammunition from Japan to Kimpo Airfield, after its capture, until such supplies could be transported by sea. Marine air units were also affected, of course, by the planning which the 1st Marine Division air and naval gunfire representatives of the Fire Support Coordination Center had already accomplished. Working aboard the _Mount McKinley_ in conjunction with their opposite numbers of PhibGru One, the FSCC group had been busy since its arrival in Japan on 18 August. Planning was conducted with the CO 11th Marines after the artillery regiment landed in Japan, and the resulting decisions coordinated with air and naval gunfire plans. The 1st MAW completed its planning on 9 September. General Cushman was designated Tactical Air Commander, X Corps, on that date and departed for the objective area the next day with the air elements scheduled to proceed by ship. CHAPTER V Embarkation and Assault _Landing of 1st Marine Division--Plan to Seize Kimpo Airfield--Shipping Assigned to Marines--Movement to the Objective Area--Strikes and Bombardments--Marine Landings on GREEN Beach--The Two Harbor Islands Secured_ On 30 August, ComNavFE issued his Operation Plan 108-50, assigning to JTF-7, of which X Corps was a part, the mission of seizing by amphibious assault a beachhead at Inchon. X Corps OpnO No. 1 was dated on the 28th, though not received by Division until the 30th. By that time, Division planning had made so much progress that Embarkation Order 1-50 was issued on the last day of the month, followed on 4 September by the final draft of Division OpnO 2-50. Operations orders of JTF-7 and TF-90 were issued concurrently.