to understandable levels, Those readers who may be required to engage in direct efforts associated with the sampling of clouds will gain an understanding of the over-all complexity of the sampling mission and will realize the importance of their specific tasks or missions. Preparation of the chapter HARDTACK was made extremely difficult because so many of the documents were in use at Johnston Island by those implementing Operation DOMINIC. It is regrettable that this work could not have been completed and published soon after the conclusion of HARDTACK, It could then have been used as a primary reference source in planning DOMINIC, with due regard to the technical contents ofthe referenced specialized documents available from the Historical Division files, Fortunately, many of the documents used in compiling this special study were assembled by a former memberof the Air Force Special Weapons Center historical staff, Mr. Warren Greene. Had Mr. Greene not secured these documents when he did, much of the story would have been lost. Unless designated as being physically located elsewhere, all documents referred to are in the files of the Air Force Special Weapons Center Historical Division, They are available to authorized individuals wishing to study their contents; it is possible that copies may be loaned when requested through proper procedures. The informality and approved direct-—communication rules which were in effect during the earlier nuclear tests enhances thevalue and interest of the documentation used. The correspondents, protagonists and antagonists, in the rare disagreements which arose, regardless of the symbols of rank worn on shoulders or the scientific status held, were iid AFWL/MO SWEH-2-0034 ‘>.