“Mr. LeBaron om weapon progress. Any alternative plan such as postponing a portion of tha shots umtil the Pall of 195) would be uneconomic and harmful to either the lomediate “energency capability" crorram or future progress in the ficld of thermonuclear weanons. The earliest Leasiblou date for scheduling the start of the CASTie tests is March 1, 195). This is based on the rate of supply of lithium=6, the bime required for fabrication, shipment, and assenbly of Weapon components, and the sched:les for construction of tes ‘sites and Installation of equipment at BIKTN? and ENIN:TOK, work on which is underway in both places. “eports prepared by the iiviston of Military Application, los Alamos Selentific Laboratory, and the Imiversity of California Sacdlation Laboratory, Livermore, are anclosed as background infor-= mation relative to the CASTLE program and for detailed information relative to the weapon prototypes and test. devices to he explored, Appended to the Los ilamos report are vossibie production schedules for the emergency capability period. These schedules ara being reconsidered in lirht of the recently received Joint Thiefs of staff's vequirements for thermonuclear weaporis. ™ summary, CASTL’ plans are as follows: geenemtETN {OF b. The first test will be scheduled for March 1, 199h, and the Sequence, exact dates, and locations cD the various tests wlll be determ ned by the Commander of Joint task Poree Seven in conjunction with the Los Alamos and UCiieLivermore Laboratories. Assurance of the Dspartment of Defense support of this very important program is requested. cineceraly yours, tye Lewis L. “trause , Chairman . oo Inclosures¢’ AU = CASTLE Prorram Background, on , & Discussion prepared by MA, Cpy 1A oan Pe ha od Le gible he ae ees Dp ‘ nyt wt «ocRpt, 9/22/53, frm LASL, Cpy 1pa fed nah, BNE ks acd! Rpt, 9/21/53, cey 10 ye. fe af frm Ven LEO PERE wh Gas exegy PE Wi eh as fl a oe shes noR kh + een % vahe eh be a a. . Li fe