of samples procured for AFOAT-1 by TG 132.4 units, (2) operation of the small field laboratory for preliminary counting of filter papers, (3) operational and technical control of Project 7.6 activities at Wake and Tarawe, and (4) coordination with TG 132.4 and Projects 1.3 and 5.45 on matters pertaining to sample collection. Certain surface measurement requirements for Project 7.5 have been approved by TG 132.1 and forwarded to JIF 132 with the request taat these requirements be established witn TG 132.3. These measure- ments include tae neignt and initial movement, after stabilization, of tne visible debris and/or associated ice crystal cloud and are to be taken from two separated surface (ship) locations within a 50-mile radius of ground zero. These measurements would be made by the ship's aerology section personnel using regular meteorological theodolites and weather radar equipment. Tue original plan for distant optical observations (Project 7.6) during Ivy operations envisioned two island stations, Wake and Kusaie, and two aircraft stations norts of Eniwetok at about 600 miles and 1,200 miles distant. Tris plan nas been cnanged by eliminating the. aircraft stations, and changing the soutaern location from Kusaie to Tarawa. These cuanges were proposed because (a) experimentation during the Tumbler-Snapper operations indicated that the present equipment when operated in an aircraft during daylight presented noise fluctuations of an order t.at would obviate the reception of a signal at distances, (b) best information to date is that there will be no . night-time shots, (c) more complete weather information indicates that