radiation exposure from in-cloud flights. Some Observations On Technique A terse, all-inclusive instruction concerning need for sampling operations and requirements was restated in preparation for Operation TRUMPET. In a memorandum for the Director of Research and Development, Air Force Special Weapons Center, Captain A. B, Gordon, Assistant Executive AFOAT-1, stated, "It is planned that debris from each detonation will be analyzed by AFOAT~1. Analysis of debris will provide calibration data for use in diagnostic evaluation of nuclear devices and weapons; special studies of analytical techniques "> He continued, It is anticipated that close-in sampling will be conducted by the 926th Test Squadron (Sampling) under the technical supervision of a representative from either UCRL, LASL or other sponsoring agencies, Representative samples of particulate debris from each shot would be supplied to McClellan Sentral Laboratory by UCRL, LASL, or other shot sponsors within approximately 8 hours of shot time, It is expected that the following types of samplers may be required: (1) Close-in air filter samples by use of aircraft for all U.S. events, (2) Fall-out and crater samples for surface or near surface detonation of low yield devices (less than 00 KT), Gas samples will be collected by the 926th Test Squadron (Sampling) under the direction of LASL and UCRL represen- tatives., Sample analyses will be performed by laboratories under contract to AFOAT-1. It is probable that samples will be required from no more than ten shots. + Operation TRUMPET was in planning stages at this time, February 1958. It was expected to follow Operation HARDTACK, 212 AFWLHC S¥EH-2-003) ty Ot