( FRIVAGY ACT MATERIAL REMO VED conclusion of theso Statosidos mcctings, the Commm dor of Task Group 7.1, ; . was satisfied that tho procedures wuld truly placo the aircraft in a safo pesition if he providod e« correct yield forecast on which to basa the docision of positioning. On 20 Fobruary, tho finel positioning meeting was hold at Perry Island. At thet tim _ coumented that he hed rececivod tho final forecast of yicld for tho BR.VO device, which vosEY ayy as a maximum yicld and as a probable yicld. This devico, incidentally, insisted that tho positioning of the cffects aircraft should be based on the maximum possible, becauso of doubt in his own mind cs to the cazploto reactions, “ith this thought in mind, the wmmittoe concurred md positioned the B--36 at 50,000 fect horizontal rango and 33,000 foct altitude, and tho B47 at 48,006 foot horizontal rmge and 35,000 fect altitude. BRiVO was scheduled for 0645 on 1 March. The wonther was considorcd satisfactory and -11 task groups were ready for tho operation, «it 0€°%, the device was detonated] and the results appeared to be extrenely good from the observers' point of view at Eniwotok. The take-off schoJule for airersft was closcly adher2d to and samplo collucting by manned aircraft commenced. Firttoor P-84C and two FB-36 typo” aircraft wore used for this purpose. Zt was considered uh 12 operntiohal F-@4's could constitute the required number cf samplers. In addition, a W2-29, with "shoc box" type sanpler, was cnmployod at Tee °