in November in favor of two more-advanced Minute Man warheads. - One is the LRL pe xu-56-20f Jena the other is, as the XW-59. known Both are now in Phase III. This Quarterly Report for the first time indicates, at least in terms of numbers of tests, a decrease in the test operations on various bombs, missiles and rockets, and other systems. It is not a terribly large decrease. | Project Buckboard is reported on. It was designed, "to provide basic information concerning formation of craters by chemical explosives in hard rock" and is part of the Plowshare program. Several tentative conclusions were reached and are reported upon here. Sandia has also been doing some investigation with experimentation on air blast predictions and measurements, in part due to the need to understand this for these explosions for Plowshare projects. Another activity where Sendia has been working with the military for tne past several years isin the area of determining how susceptible certain weapon components are to EM radiation. January - March, 1961: Under the specific weapons developments, the Vela Uniform program shows the Whirlaway Mark VII device and it says, "Radiation testing has been completed at Sandia which verifies that with proper thermal protection a Whirlaway; jf device may be safely placed in an underground cavity fifteen days after the detonation off] five ict] [in the same cavity. Electrical and mechanical dry runs have been successfully completed at Sandia on af nated _]mimewey device in preparation for a compatibility test to be conducted at NTS in April." Also mentioned in the weapons section is Sandia's participation in an Afswe/sri vulnerability test program “to determine the effects of x-rays on warheads/reentry vehicle assemblies. The effects are simulated by a high explosive detona-