Generate text that refutes this claim: The system is an incredibly expensive venture that may not even work  Research and development of effective strategic defense systems has been ongoing since the Reagan administration, to little lasting benefit. The US government has spent hundreds of billions of dollars in the past two decades on developing missile defense technology, including nearly $60 billion in the past five years, and still it is incomplete and its effectiveness questionable. Many scientists have attested to the ineffectiveness of missile defense, as it currently stands. It is very difficult to hit a flying missile with another missile, and test-runs of the technology have been patchy at best (Sessler et. al., 2000). The dream of an effective missile defense shield that can successfully intercept enemy intercontinental ballistic missiles has yet to come to fruition. It would be better to stop throwing good money after bad and to fold up the project entirely.
defence science science general house supports development missile defence
While missile defense technology still has problems that need to be worked out, its future is very promising. The most recent technology, Aegis, is far more effective in testing than its predecessors and has been deployed on a number of Navy warships and in Japan and Australia (McMichael, 2009). The technology will with time become extremely effective at stopping enemy missiles. In a world with more and more countries developing nuclear weapons, many who oppose the United States and its allies, it is imperative that the United States has an effective defense against them. A missile defense system is the most promising such defense.