TAB A CHEROKEE EVENT OPERATION REDWING 1. CHEROKEE was detonated over NAMU Island (CHARLIE) of BIKINI Atoll at O551M, 21 May 1956. feet. The estimated burst altitude was 5,000 The cloud reached an estimated height of &0,000 feet with the lower portion moving to the Northwest and upper and main portion moving generally to the East-Northeast at approximately 10 knots. Early reports on cloud height and initial cloud movement vere provided by cloud penetration and sampler eireraft., f/11 reports gave low intensities and confirmed the forecast cloud trajectories. ~ As expected, the radiation exposure of the aircraft crews was relatively DNA lowe 2. ZEBRA and ZEBRA I PeV radiation reconnzissance aircraft were placed in holding patterns so located and oriented as to intercept any cloud segments moving toward ENIWETOK or the task force fleet. (See TAB I for ZSBRA and ZEBRA I holding patterns.) 3, WILSON I (WB-SO cloud tracker) conducted a search beginning at H*6 hours in a 30° sector, true bdaring 060° through 090° with apex on RONGERIK, and extending 300 miles to the Hast. (See T/B G.) Two contacts were made,in each case, the intensities were less than 10 mrfhr. WILSON II search shown in TAB G encountered no siymificant rediation. He-gEF-SEVEN-LOG