ATOMIC ENERGY COMMISSION WASHINGTON23, D.C. 79040 a wR feat Nm AT mo Fes. - 4 DELE!iEL genoivi UiALY Dear Mr, LeBarone - oA To facilitate plaming for eilitary participation and support of atomie tests, the Commission wishes te inform the Committee of its curreut plans for future full-scale weapons test operations, Three separate and distinct series will be discussed in this letter. } 25, 1952 hon April yt A wsomzary cf plans for IVY was forwarded ta you by our letter of Cetober 29, 1961, together with a copy of AEG 483/le Since that time the Comiasion ataff and AEG contractor personne] have continued to work with Joint Yask Foree 132 and Armed Forces Special Heapons Project toward IVY and heve participated in drawing up a mutuclly acceptable technical program, Three changes im the original concept have devhloped. Firat, we now plan to evacuate all personel from the Atoll prior to the thermonuclear (MIKs) shot, since the safety of the firing party if left ashore \ is doubtful, . . ‘ - ~- : Second, the high-efficiency, high yield (400-600. KT) fission device (KIEQ@ shot) is scheduled te -——~ Third, unavoidable delays te date ism engineering, fabricate ing, and procuring materials fer the cryogenie and other = . ) Aue| voiceMWAC1- S$) Conieeliea Lecaten LG S25 us ‘ sages revere sexy ThE GY follow the MIZ® shat; eonditions fellowing MIZE permitting, technical apparatus have forced @ change in scheduled shot date for MIXR frou Ogtobver } te Novecber 1, 1952, UPS Hog aa we Consideration hes been given to conducting another fulle- scale test operation (UPSHOT) at the Fevada Proving Ground following TUMELER-SNAPPER. We had tentatively planned te conduet UPSi0f im the Fall of 1952, I¢ has recently bees determined that UPSHOT camag$ be conducted prior te the early Spring of 1955. A target date for the beginning of the operation is February 1, 1953. These plans, however, must nentse Devices for testing during UPSHOT havesot bees com= Leticia pee pletely determined at this tine. CLASSIFICATION CANCELLED “= fe < remain subjest tochange in the exent ofunexpected develope nr& WITH DELETIONS 0 Fa rede - aDc g . WUTARY RESEARCH & APPL, 4133/P6 ‘oe