give a significant nuclear yleld if detonated through fire on. crash. At present there are a total of 12 planned. To date 6 of the safety shots have been fired. . Most of these shota are being fired in 500 foot | holes. One which contains no plutonium has been fired from a captive balloon. EXPLORATORY - In the exploratory field we have two main objectives. ae The firstof these (Chart) is to develop low yield warheads for tactical missiles of the future. Future missile systems will be emaller, lighter and more accurate and will require lighter weight loweyleld werheads . We are testing several designs which could be placed "on the shelt” in order that they would be available for use with the new miasile systema. For an immediate capability in thedowyieldarea we have modified08 00:g oe of our presently stockpiled items. J Zsx Pe, . a ee pee est will provide us with anImmediate low yieldcapability in missiles for*wate newer types will not be in stock-. pile for some time to com. EXPERIMENTAL « In the experimental category we are examining three general areas, 4 gs device w underground with the X-ray experi~«_ ment‘taking place in a 10-inch vacuum ‘tube some 160 feet long. Briefly the other two cxperinental. devices concern: Melt is intended“toproduceveryhig compressic “econony; a the use of active material. meas wi os VA . te}

Select target paragraph3