Here is a press release from the Missile Defense Agency on the successful completion of a KEI exercise that is preparing the system for its first flight test later this year:

Kinetic Energy Interceptor Prepares for Flight Testing with Simulated Launch Countdown

The Missile Defense Agency successfully completed an important exercise of the Kinetic Energy Interceptors(KEI) program in preparation for its inaugural flight test later this year. Team members executed simulated
launch countdown activities of an inert pathfinder Kinetic Energy Interceptor (KEI) booster vehicle on April 9, 2009, at Vandenberg Air Force Base, Calif., as a risk reduction effort for the first flight test of the highacceleration vehicle.

The KEI pathfinder missile, fully functional with the exception of inert motors, was tested with range instrumentation, launch operations personnel and launch procedures. This pathfinder vehicle test has validated
launch operations activities in preparation for flight testing.
KEI is designed to be a mobile, globally deployable missile defense system featuring MDA’s newest highacceleration booster. KEI will provide the Ballistic Missile Defense System (BMDS) with a capability to defeat
long-range ballistic missiles during the boost, ascent, and midcourse phases of flight.

By engaging hostile missiles in early stages of flight, KEI increases intercept opportunities and enhances the BMDS layered defensive capability.
The KEI program is managed by the Missile Defense Agency in Washington, D.C., and executed by the KEI Project Office in Huntsville, Ala.  [Missile Defense Agency]