These instructions were confirmed by letter (LAB-J, D-T), dated May 11, 1950, from the Chief, AEC-NME Test Security Branch, Santa Fe Operations Office. This letter emphasized the necessity for economy in clearance costs and the necessity for careful consideration as to the needfor clearance before initiating processing. The deferment of clearance submissions at this time, in view of the uncertainty as to the number of "Q" clearances to be required, was disadvantageous to the Holmes & Narver clearance program in that it increased the number of "P" approval personnel at the Jobsite who would later have to be submitted for a "Q" clearance. The extent of the disadvantage of deferred submissions was apparent in the fall of 1950, when the time came to insure that all persons who were expected to remain at the Jobsite after January 15, 1951, were submitted for "Q* clearance, By this time, because of greatly expanded construction requirements, it was found necessary to process all "P* approval men then at the Jobsite for "Q" clearance, except those whose contracts were to expire, in order to insure the presence of enough "Q" cleared personnel to complete the job, As a result, approximately 430 men with "P" ap-— provals had to be processed for "Q" clearance, and each one had to sign & new personnel security questionnaire, Because of the number of men involved and their distribution in all parts of the Atoll where work was in progress, it was a major and time-consuming task to locate them and to complete their processing. As a result, clearance submissions were delayed in many cases and it was not until the middle of November that all needed clearances of men at the Jobsite had been submitted, Furthermore, the submission of this large number of "Q" clearance requests over a short period of time placed an overload on the investigative and other clearance agencies and resulted in a considerable increase in clearance time required. In July 1950, Jobsite management was requested by the Security Division, Holmes & Narver, to submit names of men at Jobsite who would probably be needed on the job after January 15, 1951, although at that time it was difficult to make accurate predictions as to what personnel would actually be needed, It was then expected that all basic construc- tion would be finished by January 15, 1951, but the many increases in the scope of the Projeet had not as yet been made, In August 1950, it was estimated that approximately 950 employees would be required on January 15, 1951; but on that date there were actually 1826 employees at the Jobsite, As the job work progressed in the fall, it became increasingly apparent because of increases in job requirements that the number of clearances in process would not be adequate to provide the added number of cleared personnel needed on the limiting date of January 15, 1951. On October 11, 1950, it was recommended that "FP" approval personnel be permitted at Jobsite until March 1, 19511, This recommendation 1 Letter, CHN991, dated Oct, 11, 1950 addressed to Manager, AEC Santa Fe Operations Office, 7-8