VII sampling comprised one B-57 and six F-84G aircraft and two B-57 control planes. Through MSQ-1A4 radar, officials positioed the four effects aircraft with only minor errors, CHEROKEE. After several postponements because of weather conditions, a B-52 dropped a large-yield weapon for CHEROKEE Shot. All aircraft had azimthal errors and horizontal range far different from those planned because of the aiming and timing errors in dropping the device, Much of the data obtained resulted from aircraft positioning procedureg which were initiated upon realization that the countdown had become erratic, According to the mission description, h2 aircraft were scheduled to participate including the drop B-S2 and the canister drop B-36. Only 38 aircraft took part but the aborts were not samplers, Three B-57 and six F-84G with 1 cmtrol B-57 made. up the sampling effort. ZUNI and YUMA, On 28 May, dual shots occurred for the first time in weapon testing: UNI on Bikini Atoll and YUMA at Eniwetok, Fifty aircraft were scheduled for the dual event, 11 for YUMA and 39 for ZUNI., No B-57 samplers participated in the former, but six F-8G took samples with one B-57 control aircraft. For the 2UNI Shot there were four B-57 samplers and two F-8LG with one B-57 control aircraft. ERIE. Atoll, UNI went first, On 31 May, this shot occurred on a 300-foot tower on Eniwetok H-hour was 0615:30. Seventeen aircraft participated under the control of the Air Operations Center without incident. Of these, one B-57 and six F-8)G aircraft were samplers under one B-57 control, SEMINOLE, The sixth shot occurred at 1255:30 hours on 6 June at 1h7 AFWUHO SWEH-2-003), bY