Bikini, Eniwetok, and Kwajalein Atolls. c. Special MATSflights will be utilized for all sample-return missions, and the arrange- ments for these flights will be made well in advance of the operational phase. d. Devices having yields which cannot be accurately predicted will be detonated. Considering these assumptions, it is recommended that a. This Headquarters, under the direction of CJTF 132, be given the responsibility for submitting the requirements for sample-return flights and, in addition, the mission of estab- lishing times of departure, points of departure, loads to be carried, radiological-safety measures in flight, etc. b. The above-mentioned planning be predicted on assumption d. This implies that maximal aircraft utilization may be necessarily sacrificed, since postshot radiological-safety conditions can dictate radical departures from planned recovery programs. c. This Headquarters be given the mission of supervising the loading and dispatching of all sample-return aircraft, to include dictating itineraries (within the structure of MATS regulations) and assignment of couriers and monitors and/or high-priority (i.e., experimental program) passengers. d. All messages designed to alert personnel as to itinerary, cargo and/or passengers carried, or special facilities required at points of landing be originated by this Headquarters. Furthermore, all such messages should contain specific information as to what is being transported where for whom. 2. The numberof intra-atoll aircraft as augmented by the Navy helicopters was adequate for the operation. It is the present opinion of this Headquarters that the L-13 aircraft could be replaced by H-19 helicopters, thereby increasing operational flexibility and reducing over-all dual maintenance and spare-parts problems. It is recommended that there be sufficient type. H-19 helicopters to provide a minimum of eight in an operational condition at all times. 3. TG 132.3 furnished helicopters to augment the intra-atoll aircraft. However, because this support was considered secondary to their primary mission, interpreted to be re-entry and recovery, some difficulty was encountered in obtaining the use of these aircraft throughout the preshot periods. In future operations it is recommended that, when someof the supporting aircraft belong to another Task Group, the primary mission of these aircraft should be so defined as to include support, as required, throughout the entire operational phase. 4. The number and types of boats in the TG 132.1 and the TG 132.3 boat pools are considered adequate. The Navy LCU’s were not equipped with the SCR 508 radios which were used in boat dispatching. It is recommended that the same numberand types of boats be used for an operation of the size of Ivy and that all boats be equipped with SCR 508 radios to ensure maximum control and utilization. 5. The boat pools were used to their maximum capability during the Mike evacuation period because of the additional requirements of unloading a reefer and loading cargo vessels for return to the ZI. It is recommended that reefer and cargo vessels not be scheduled for loading or unloading less than 5 days prior to a total evacuation. 6. The total number of vehicles was considered adequate. It is recommended that the numbers of vehicles remain the same for an operation similar to Ivy. 7. The use of two PBM’s to support weather stations and projects on other atolis, as well as to provide air-sea rescue service is considered inadequate to maintain reliable schedules. It is recommended that two PBM’s be available for JTF operational requirements to off-atolls and that an additional PBM be assigned for other missions. 8. Submarine and overhead cables required for the Ivy telephone system were difficult to obtain from commercial sources owing to critical shortages. These cables arrived just in time to prevent a serious obstruction to operations. It is recommended that a stockpile sufficient to meet the maximum anticipated needs for the next operation be established by the AEC at Eniwetok at the earliest possible date. 9. The type SCR 508, SCR 300, and TCS-12 radios proved most satisfactory when they were used to meet operational requirements which were within their respective design capa52