"The approximate size is 275 hectares (approx 680 acres) for an interceptor missile site and approximately 30 hectares (12 acres) for a single radar site. The United States estimates approximately 200 military, Government civilian, and support contractors will be required to operate the interceptor site. The United States estimates approximately 150 personnel will be required to operate the radar site," it said.

It said a total of 10 interceptor missiles in underground silos would be located at the facility in Poland. The interceptor base will require facilities for electronic equipment for secure communications, missile assembly, storage, maintenance, and security.

The State Department said the ballistic missile defense interceptors that would be installed are for purely defensive purposes and have no offensive capability.

"They carry no explosive warheads of any type, relying instead on their kinetic energy alone to collide with and destroy incoming warheads. Silos constructed for deployment of defensive interceptors are substantially smaller than those used for offensive missiles. Any conversion would require extensive modifications, thus precluding the possibility of converting the interceptor silos for use by offensive missile," it said.

The Fact Sheet said intercepts occur in space at very high altitudes (above the atmosphere) with the vast majority of the threat warhead and the interceptor reduced to small pieces that burn up upon reentry.

"A few small pieces may survive reentry, but pose little threat to people and property. The odds of damage or injury from an intercept are very small. European interceptors would not be used for flight tests, and would only launch during an actual attack on the United States or Europe," it said.

It said the U.S. missile defense system has been proven effective through repeated testing. Since 2001 the Missile Defense Agency has had 26 successful missile intercepts; fifteen of the last sixteen flight tests have been successful.

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