Conventional Prompt Global Strike and Long-Range Ballistic Missiles: Background and Issues [open pdf - 1MB]
"This report focuses, primarily, on the Pentagon's ongoing program to develop ballistic missile-based conventional prompt strike systems. This effort has been underway for about 15 years. The George W. Bush Administration demonstrated an interest in the use of conventional weapons for precision, long-range strike missions in the 2001 Nuclear Posture Review (NPR). This study called for the integration of precision conventional weapons with strategic nuclear forces in a new category of 'offensive strike' weapons. Several other Pentagon studies published during the Bush Administration also called on the United States to develop the capability to attack targets around the world, in under an hour, with conventional warheads."
CRS Report for Congress, R41464