CHAPTER IV, SECTIONS 4 and 5 Returned to the U.S. Navy after OPER- period the services of the LSD were made avail- ATION IVY able for hull repairs. On completion of the op- erations at Bikini all the craft were returned to 1 - LCU 29 - YC Barges (wooden) 6 - LCMs Eniwetok, where major overhaul was scheduled. Maintenance facilities at Eniwetok consisted primarily of the engine repair shop, DUKW shop, electrical and injector shop, the hull repair yard, and a Gilhoist and floating dry dock. These were adequate. Water Taxis and LCMs Received from the U.S. Navy for OPERATION CASTLE 4 - LCUs 5 - LCMs 2 - YC Barges (steel) were beached for major repairs; tugs, LCUs and barges were dry-docked. Figure 4-34 shows an LCU in thefloating dry-dock. To be ‘retuned CASTLE The H&N marine repair group was called upon during this Operation for servicing and maintenance on craft under the control of and OPERATION 1 - YTL (wooden) 4 - LCUs 1 - AFDL-5. (To be returned to Jobsite after dry docking). operated by other Task Units. This work was accomplished under Job IV work orders. Received from the U. S. Army All items of maintenance work performed 6 - Army type 585-ton barges - four of these were expended for Scientific purposes. 15 - DUKWs. One expended and surveyed. on each craft were recorded in a maintenance history. A record of dry dock operations indi- cated that the AFDL-5 was used for 31 dockings during the period from January 1953 through April 1954. Returned to the U.S. Army EXCHANGE OF CRAFT.The terms and conditions that apply to loans of marine craft by the Navy Department to the Atomic Energy Commission is outlined in the Joint AEC - Department of the Navy agreement OPNAV 4000 10 A (7/1/53). In accordance with this agreement, joint inspections were made on all exchanges effected for this Operation. The reports of these inspections were furnished the AEC Resident Engineer, and copies were retained in the Contractor’s files for future use in adjudication of costs. The following are the exchanges effected during this operation: 15 - DUKWs. A comparison of costs of major overhaul of LCMsby the Navy and the Jobsite was made. The Jobsite costs were actual costs incurred, and the Navy costs were those estimated for work on LCMsreturned to the Pear! Harbor Navy Yard after OPERATION IVY. This comparison is indicated below. Based on this comparison, all LCMshereafter will be retained at the Jobsite after completion of an operation, and the boats will be owerhauled by Jobsite forces and mothballed on the site. NAVY YARD A-boat B-boat Hull Machinery after $9,362.00 3,287.00 $9,576.00 3,287.00 C-boat JOBSITE D-boat $4,910.00 4,665.00 $5,240.00 4,665.00 SECTION 5 AIR TRANSPORTATION Interatoll air transportation for the move- ment of personnel, mail and urgently-needed called for two flights per week, but were increased as the tempo of the work increased, of PBMs until 30 January 1953. On this date the landing field on Peter-Oboe was placed in use and thereafter flights of C-47 type planes were regularly scheduled. At first the schedules during periods in which the airfield at Bikini could not be used, PBMs were again provided materials and supplies was provided by means reaching a peak in 1954 of four flights per day six days a week. In March and April of 1954, to furnish this support. Passenger scheduling Page 4-47