OTOL? Flight #3 (H/24 to H436 hours): This flight will attempt to determine the extent of drift of other major segments of the atomic cloud as practicable and as required by existing meteorological in- fluences. Areas and altitude of search are to be specified later and will be contingent upon the above influences and the results of flight #1 and #2. Specific instructions for this mission will be forwarded by CJTF SEVEN to CTG 7.4, ATIN: Commander, Test Services Unit, not later than eight (8) hours prior to scheduled aircraft takeoff. , Flight #4 (H436 to HAS hours): The necessity for scheduling this flight will be determined by CITF SEVEN on the basis of the result of Flights #1, #2, #3, and other sources, Mission instructions from CJTF SEVEN will be routed through normal command and communications chan~ nels. However, to insure that advance details get to TG 7.4 sufficiently in advance of the missions, informal mission instructions will be transmitted through USS ESTES Weather Central Eniwetok Weather Station RATT channels by mission take-off time minus eight (8) hours for each i> flight. The basic requirement for cloud tracking flights is to provide data of sufficient accuracy to support conclusions and decisions relating to health hazards, and to confirm dr modify forecast cloud segment drift. In general, the missions are to be flown on the tracks specified with max~ imum emphasis on complete coverage of the designated areas. It is not anticipated that in flight analysis of the overall situation will be necessary, except that tracking aircraft crews should re- cognize cloud boundaries and leading edges. Deviations from the prescribed track and reporting positions should be made only in the event of entry into highly contaminated areas. For cloud tracking mission, turn-out will be executed when intensities of 3.0 r/hr are approached. Following such turn-out, appropriate in-flight adjustment of track should be made by the aircraft commander in the interest of maximum coverage of the desig- nated area, The rad/safe monitor will exercise discretion en turn-out-from contaminated areas, carefully corsidering crew personnel dosages and the anticipated length of flight through the radiation field. Since precise measurements are not required, suitable RADIAC equipment and reporting codes have accordingly been specified below. Fach flight will have on board sufficient instru- ments of the following tynvs to insure reasonable expectation of proper functioning of at least one yr P eh} of each type: AN/PDR-TIB, . Mx-5 or any equivalent military instrument such as the AN/PDR-27, capable of direct reading in milliroentgens per hour. TASK GROUP 7.4 OPRS. ORDER NO. 2-54 ANNEX M an i