general discussion then followed concerning increased demands for parking space and additional maintenance personnel which would be generated by the assignment of the H-21, Colonel Lucke asked if there was any possibility of replacing the C-47 aircraft at Eniwetok with C-131's. Colonel Kelsing stated that so far as he knew the Air Force had no Cargo version of the C-131 as such and that it required several hours to remove or replace the passenger Seats, thereby reducing the versatility of this type aircraft if it were required to serve a dual purpose. He stated that C-54 type aircraft would probably be more suitable, but that even they were in short supply. Colonel Gattis will discuss the type of aircraft to be requested for HARDTACK with Colonel Wignall of TG 7.4 prior to the 20 February requirements conference, Colonel Massey then discussed the UCRL letter requesting the assignment of B-57 sampler aircraft, It was Colonel Kesling’s opinion that B-57D aircraft would not de available for this operation, and that the B-57B world be assigned only if complete justification was provided. 6. Colonel Lucke and Colonel Gattis departed Washington on the morning of 10 January for return to los Alamos, Copy furnished: AEC/DMA Chief, AFSWP UCRL (Dr. Johnson) DONNELL MASSEY Colonel, USAF AG of S, J-3 AFOAT (Col Kesling) TG 7.1 TG 7,2 TG 7.4 TG 7.5 Command Division J-1 Division J-2 Division J-4 Division J-5 Division Comptroller Historian AF WL/ HQ Ly,