According to the report , the PRC had `` stolen classified information on all of the United States ' most advanced thermonuclear warheads '' since the 1970s , including the design of advanced miniaturized thermonuclear warheads ( which can be used on MIRV weapons ) , the neutron bomb , and `` weapons codes '' which allow for computer simulations of nuclear testing ( and allow the PRC to advance their weapon development without testing themselves ) .
The report said that China had `` stolen classified information on all of the United States ' most advanced thermonuclear warheads '' since the 1970s , including the design of advanced warheads , the neutron bomb , and `` weapons codes '' which allow for computer simulations of nuclear testing ( and allow China to advance their weapon development without doing its own tests ) .