A United States National Research Council report found that the current US missile defense system is flawed, and subsequently the US is vulnerable to certain types of long-range strikes, The New York Times
The 16-person panel, comprising top scientists, engineers and weapon experts, recommended that US President Barack Obama change tack in his defense strategy. It suggested that Obama expand a system he inherited from former US President George W. Bush in order to be better prepared to defeat the type of long-range missiles Iran may be developing. In 2009, Obama decided to alter course from the Bush administration's plan, focusing on the threat of shorter-range ballistic missiles to US forces and allies in Europe and the Middle East.
The National Research Council report, however, called the existing antimissile arms "fragile” and full of “shortcomings that limit their effectiveness against even modestly improved threats,” according to the Times