oe om. "Class _H", etc, -- Gun types. So far all guns are inter- changeable, which exacts penalties especially when one goes to ° smaller and smaller déeigns. Dr. Bradbury emphasized that he was not proposing what the detailed class descriptions should be, but was proposing a philosophy, namely to fix on types in which large numbers are needed, to develop the best possible weapons, with the best achievable characteristics, of each type j without penalizing the design by requiring that the core be interchangeable with some other, i.e, strategic > weapon, The main tactical classes will require large numbers, instant readiness, and very wide deployment. Under these circumstances interchangeability is not relevant, The gain to be achieved from abandoning the array concept could be | an increase in the number of weapons by a factor of 13-2}, witnout the use of boosting. If one accepts the further specialization of boosting, the factors are probably larger still. If one clings to the concept of interchangeability, on the other hand, the further gains that can be made in the fission field are very limited. DOE ARCHIVES There was an animated discussion following Dr. Bradbury's remarks, One point in particular was whether the gep between 30 KT and 1 MT was without interest. Opinions pro and con were expressed, No one presert, however, voiced any dissent of principle with the changes in attitude proposed by Dr. Bradbury. This session was adjourned at 12:05 p.m. sot eae _