concrete work in the present operation need ever be analyzed. The data on heavy iron aggregate concrete is important stice prati-lly no information is available on this new type concrete which will become increasinglyimportant. survey @ eratjons - Lt. Col. Ihniel Kennedy. The purpoee of this introductionwill not be to state the methods used or the technical require!rents of surveying for this operation,which will follow later, but to brief the reader on the conditions surrounding the problemas they existed in October 47 and to follow the trend of procedure from then until field operations started. It is necessary to emphasize that in the beginning the operation was classifiedTop Secret. This necessitated getting non-military personnelwhen people could not be told where or when they were going; getting them to leave the country just bdore the holiday season; having them cleared by the F. B. I. in time to board waiting planes; of obtaining the necessary medical inoculations;all these in the tiitial three weeks with a rapidly dwindling time allowance for the completion of the project. The fact, too, that the site was”over six thousand miles away did not simplify matters. Secrecy and speed are not synonymous. The Engineer in charge of the section was a civilian on 13 October and a military man IA October. Between 16 and 30 October a trip was made to ~~iwetok with a stopover in Honolulu for conferenceswith various groups. Three days were spent checking existing survey control and reconnoiteringthe islands. 59 Section XVI .