a TOR SREREE: Ren b. Mark 7 (Implosion-type weapon, approximate outside diameter 30 in., approximate weight 1,600 lbs.) A new model having improved fuzing 18 now being stockpiled. ec, Mark 18 (Implosion-type bomb, outside diameter G1 in., approximateWeight 8,500 lbs,) This weapon, described above, is essentially the Mark 6 but incorporates changes required by the special nuclear component and its nuclear safing. 20, DOD participation in non-nuclear weapon production. The preceding Progress Report described the President's action in February 1953 which directed the Commission to authorize the DOD to assume primary responsibility for the production of non-nuclear components of gun-assembly-type weapons as mutually agreed upon. More recently, the AEC and the BOD jeintily recommended to the President that he direct the Commission to authorize the DOD to assume responsibility for (1) the manufacture, production, or acquisition of such non-nucleaxy components of weapons utilizing implosion-type nuclear systems as may be mutually agreed upon and (2) the custody of such non-nuclear components of the types for which they assume production responsibility, as may be mutually agreed & upon, New Weapon Facilties 21, Production, The Rocky Flats Plant near Denver, Colorado, for core fabrication, inspection, and assembly has been completed and is now in full operation. | <A special review of present and projected HE plant capacity has been completed; based on this study the Commission has e¢ancelled the construction ef the Svoon River plant, near Macomb, Ill., deseribec in the preceding Progress Report, -~ le - Part IIt