The NPR noted that 'one of the greatest challenges today is accounting for the location uncertainty of mobile and relocatable targets'. These could include aircraft, ships, troop formations, mobile command, control, and communications (C3) facilities, mobile WMD facilities, leadership, or missile launchers. The use of Iraqi Scud missiles to attack Israel and US forces in Saudi Arabia during the Gulf War underscores the requirement for capabilities that can be employed against such elusive targets. During Desert Storm, coalition aircraft carried out more than 1,500 strikes against Scud-related targets over a six-week period, but few, if any, mobile launchers were destroyed, and Iraq succeeded in launching almost 90 missiles. The potential use of mobile missiles to deliver WMD further intensifies this need. An effective theater missile defense system and the capability to locate and destroy such targets are crucial to protecting US allies, forces and regional population centers.

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Miller, Eric A. "Global Strike Capabilities: The Ballistic Missile Option." Astropolitics. Vol. 2 (2004): 1-31. [ 5 quotes ] [ page 7 ]