Reagan’s “Star Wars” missile defense shield continues to reveal itself to be an expensive mirage:

The system designed to defend American cities and towns against a nuclear attack by North Korea is “simply unable to protect the U.S. public” and will remain ineffective unless Congress exerts rigorous oversight, according to a new report.

The report, to be released Thursday by the Union of Concerned Scientists, recommends that the Obama administration halt the expansion of the Ground-based Midcourse Defense system, known as GMD, until its technical problems have been solved.

“The story of this system is a cautionary tale about how the lack of appropriate oversight of a politically charged missile defense program has led to a system in tatters,” said the report, written by three physicists with expertise in missile defense.

“Despite more than a decade of development and a bill of $40 billion, the GMD system is simply unable to protect the U.S. public,’’ the authors wrote.

………

The report notes that in “heavily scripted” flight tests that are “set up for success,” GMD interceptors have often failed to hit mock enemy warheads. In the seven most recent tests, interceptors destroyed their targets just three times, the report says — a finding consistent with conclusions of the Pentagon’s operational test and evaluation office.

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The report said members of Congress and Pentagon officials insisted on deploying and expanding the system at a rapid pace—at the expense of sound procurement and engineering.

“Repeatedly,” the report said, “the Pentagon has sacrificed quality, shortened engineering cycles and sidestepped acquisitions best practices to meet a deadline imposed by political rationales rather than technical realities.”

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The physicists write that “the continued development of the GMD system without adequate oversight and accountability, and the continued fielding of interceptors without adequate testing, means the system is not even on a path to achieving a useful ability to intercept ballistic missiles.”

As if the F-35 weren’t proof enough, it’s clear that our defense industry  is completely dysfunctional.