This February 2011 Strategic Forum paper examines Conventional Prompt Global Strike (CPGS), a concept to deliver conventional strikes anywhere in the world in approximately an hour. "The logic of the CPGS concept is straightforward. The United States has global security commitments to deter and respond to a diverse spectrum of threats, ranging from terrorist organizations to near-peer competitors. The United States might need to strike a time-sensitive target protected by formidable air defenses or located deep inside enemy territory. Small, high-value targets might pop up without warning in remote or sensitive areas, potentially precluding the United States from responding to the situation by employing other conventional weapons systems, deploying Special Operations Forces (SOF), or relying on the host country."
Strategic Forum No. 263
National Defense University, Institute for National Strategic Studies: http://www.ndu.edu/inss/