On Tuesday, Philip Coyle, a senior fellow at the Center for Arms Control and Non-Proliferation, told CNN the test “marks two successes in a row, which is significant,” but added that only two of the last five attempts were successful. “In school, 40 percent isn’t a passing grade,” Coyle told the news outlet. “Based on its testing record, we cannot rely upon this missile defense program to protect the United States from a North Korean long-range missile.”