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FILE - In this Friday, May 4, 2012 file photo, a Russian military officer is on duty in the main control center of a radar station at the missile defense facility in Sofrino, 50 km (31 miles) northeast of Moscow. Secret U.S. Defense Department studies have cast doubt on whether a multibillion dollar missile defense system planned for Europe will ever be able to protect the United States from Iranian missiles as intended, congressional investigators say. (AP Photo/Mikhail Metzel, File)

Associated Press
FILE - In this  Friday, May 4, 2012 file photo, a Russian military officer is on duty in the main control center of a radar station at the missile defense facility in Sofrino, 50 km (31 miles) northeast of Moscow. Secret U.S. Defense Department studies have cast doubt on whether a multibillion dollar missile defense system planned for Europe will ever be able to protect the United States from Iranian missiles as intended, congressional investigators say. (AP Photo/Mikhail Metzel, File)
FILE - In this Friday, May 4, 2012 file photo, a Russian military officer is on duty in the main control center of a radar station at the missile defense facility in Sofrino, 50 km (31 miles) northeast of Moscow. Secret U.S. Defense Department studies have cast doubt on whether a multibillion dollar missile defense system planned for Europe will ever be able to protect the United States from Iranian missiles as intended, congressional investigators say. (AP Photo/Mikhail Metzel, File)
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