You're right it's not a ballistic missile, but it's end goal is in many ways the same:
"Prompt Global Strike (PGS) is a United States military effort to develop a system that can deliver a precision conventional weapon strike anywhere in the world within one hour, in a similar manner to a nuclear ICBM"
"Prompt Global Strike (PGS) is a United States military effort to develop a system that can deliver a precision conventional weapon strike anywhere in the world within one hour, in a similar manner to a nuclear ICBM"
http://en.wikipedia.org/wiki/Prompt_Global_Strike